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-            doc
+/*
-            kweitzel
+Copyright (c) 2009, Yahoo! Inc. All rights reserved.
-            doc
+Code licensed under the BSD License:
 http://developer.yahoo.net/yui/license.txt
-            kweitzel
+version: 2.8.0r4
-            doc
+*/
 /**
  * The dom module provides helper methods for manipulating Dom elements.
  * @module dom
+ *
  */
 (function() {
-            kweitzel
+    // for use with generateId (global to save state if Dom is overwritten)
     YAHOO.env._id_counter = YAHOO.env._id_counter || 0;
     // internal shorthand
     var Y = YAHOO.util,
         lang = YAHOO.lang,
         UA = YAHOO.env.ua,
         trim = YAHOO.lang.trim,
-            doc
+        propertyCache = {}, // for faster hyphen converts
-            kweitzel
+        reCache = {}, // cache className regexes
         RE_TABLE = /^t(?:able|d|h)$/i, // for _calcBorders
         RE_COLOR = /color$/i,
         // DOM aliases
         document = window.document,
         documentElement = document.documentElement,
         // string constants
         OWNER_DOCUMENT = 'ownerDocument',
         DEFAULT_VIEW = 'defaultView',
         DOCUMENT_ELEMENT = 'documentElement',
         COMPAT_MODE = 'compatMode',
         OFFSET_LEFT = 'offsetLeft',
         OFFSET_TOP = 'offsetTop',
         OFFSET_PARENT = 'offsetParent',
         PARENT_NODE = 'parentNode',
         NODE_TYPE = 'nodeType',
         TAG_NAME = 'tagName',
         SCROLL_LEFT = 'scrollLeft',
         SCROLL_TOP = 'scrollTop',
         GET_BOUNDING_CLIENT_RECT = 'getBoundingClientRect',
         GET_COMPUTED_STYLE = 'getComputedStyle',
         CURRENT_STYLE = 'currentStyle',
         CSS1_COMPAT = 'CSS1Compat',
         _BACK_COMPAT = 'BackCompat',
         _CLASS = 'class', // underscore due to reserved word
         CLASS_NAME = 'className',
         EMPTY = '',
         SPACE = ' ',
         C_START = '(?:^|\\s)',
         C_END = '(?= |$)',
         G = 'g',
         POSITION = 'position',
         FIXED = 'fixed',
         RELATIVE = 'relative',
         LEFT = 'left',
         TOP = 'top',
         MEDIUM = 'medium',
         BORDER_LEFT_WIDTH = 'borderLeftWidth',
         BORDER_TOP_WIDTH = 'borderTopWidth',
             doc
     // brower detection
-            kweitzel
+        isOpera = UA.opera,
         isSafari = UA.webkit,
         isGecko = UA.gecko,
         isIE = UA.ie;
             doc
     /**
      * Provides helper methods for DOM elements.
      * @namespace YAHOO.util
      * @class Dom
-            kweitzel
+     * @requires yahoo, event
-            doc
+     */
-            kweitzel
+    Y.Dom = {
         CUSTOM_ATTRIBUTES: (!documentElement.hasAttribute) ? { // IE < 8
             'for': 'htmlFor',
             'class': CLASS_NAME
         } : { // w3c
             'htmlFor': 'for',
             'className': _CLASS
         },
         DOT_ATTRIBUTES: {},
-            doc
+        /**
          * Returns an HTMLElement reference.
          * @method get
          * @param {String | HTMLElement |Array} el Accepts a string to use as an ID for getting a DOM reference, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @return {HTMLElement | Array} A DOM reference to an HTML element or an array of HTMLElements.
          */
         get: function(el) {
-            kweitzel
+            var id, nodes, c, i, len, attr;
             doc
-            kweitzel
+            if (el) {
                 if (el[NODE_TYPE] || el.item) { // Node, or NodeList
                     return el;
             doc
             kweitzel
                 if (typeof el === 'string') { // id
                     id = el;
                     el = document.getElementById(el);
                     attr = (el) ? el.attributes : null;
                     if (el && attr && attr.id && attr.id.value === id) { // IE: avoid false match on "name" attribute
                         return el;
                     } else if (el && document.all) { // filter by name
                         el = null;
                         nodes = document.all[id];
                         for (i = 0, len = nodes.length; i < len; ++i) {
                             if (nodes[i].id === id) {
                                 return nodes[i];
+                            }
+                        }
+                    }
                     return el;
+                }
             doc
-            kweitzel
+                if (YAHOO.util.Element && el instanceof YAHOO.util.Element) {
                     el = el.get('element');
+                }
                 if ('length' in el) { // array-like
                     c = [];
                     for (i = 0, len = el.length; i < len; ++i) {
                         c[c.length] = Y.Dom.get(el[i]);
+                    }
                     return c;
+                }
                 return el; // some other object, just pass it back
             doc
-            kweitzel
+            return null;
-            doc
+        },
-            kweitzel
+        getComputedStyle: function(el, property) {
             if (window[GET_COMPUTED_STYLE]) {
                 return el[OWNER_DOCUMENT][DEFAULT_VIEW][GET_COMPUTED_STYLE](el, null)[property];
             } else if (el[CURRENT_STYLE]) {
                 return Y.Dom.IE_ComputedStyle.get(el, property);
+            }
         },
-            doc
+        /**
          * Normalizes currentStyle and ComputedStyle.
          * @method getStyle
          * @param {String | HTMLElement |Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @param {String} property The style property whose value is returned.
          * @return {String | Array} The current value of the style property for the element(s).
          */
         getStyle: function(el, property) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._getStyle, property);
-            doc
+        },
             kweitzel
         // branching at load instead of runtime
         _getStyle: function() {
             if (window[GET_COMPUTED_STYLE]) { // W3C DOM method
                 return function(el, property) {
                     property = (property === 'float') ? property = 'cssFloat' :
                             Y.Dom._toCamel(property);
                     var value = el.style[property],
                         computed;
                     if (!value) {
                         computed = el[OWNER_DOCUMENT][DEFAULT_VIEW][GET_COMPUTED_STYLE](el, null);
                         if (computed) { // test computed before touching for safari
                             value = computed[property];
+                        }
+                    }
                     return value;
                 };
             } else if (documentElement[CURRENT_STYLE]) {
                 return function(el, property) {
                     var value;
                     switch(property) {
                         case 'opacity' :// IE opacity uses filter
                             value = 100;
                             try { // will error if no DXImageTransform
                                 value = el.filters['DXImageTransform.Microsoft.Alpha'].opacity;
                             } catch(e) {
                                 try { // make sure its in the document
                                     value = el.filters('alpha').opacity;
                                 } catch(err) {
                                     YAHOO.log('getStyle: IE filter failed',
                                             'error', 'Dom');
+                                }
+                            }
                             return value / 100;
                         case 'float': // fix reserved word
                             property = 'styleFloat'; // fall through
                         default:
                             property = Y.Dom._toCamel(property);
                             value = el[CURRENT_STYLE] ? el[CURRENT_STYLE][property] : null;
                             return ( el.style[property] || value );
+                    }
                 };
+            }
         }(),
             doc
         /**
          * Wrapper for setting style properties of HTMLElements.  Normalizes "opacity" across modern browsers.
          * @method setStyle
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @param {String} property The style property to be set.
          * @param {String} val The value to apply to the given property.
          */
         setStyle: function(el, property, val) {
-            kweitzel
+            Y.Dom.batch(el, Y.Dom._setStyle, { prop: property, val: val });
-            doc
+        },
             kweitzel
         _setStyle: function() {
             if (isIE) {
                 return function(el, args) {
                     var property = Y.Dom._toCamel(args.prop),
                         val = args.val;
                     if (el) {
                         switch (property) {
                             case 'opacity':
                                 if ( lang.isString(el.style.filter) ) { // in case not appended
                                     el.style.filter = 'alpha(opacity=' + val * 100 + ')';
                                     if (!el[CURRENT_STYLE] || !el[CURRENT_STYLE].hasLayout) {
                                         el.style.zoom = 1; // when no layout or cant tell
+                                    }
+                                }
                                 break;
                             case 'float':
                                 property = 'styleFloat';
                             default:
                             el.style[property] = val;
+                        }
                     } else {
                         YAHOO.log('element ' + el + ' is undefined', 'error', 'Dom');
+                    }
                 };
             } else {
                 return function(el, args) {
                     var property = Y.Dom._toCamel(args.prop),
                         val = args.val;
                     if (el) {
                         if (property == 'float') {
                             property = 'cssFloat';
+                        }
                         el.style[property] = val;
                     } else {
                         YAHOO.log('element ' + el + ' is undefined', 'error', 'Dom');
+                    }
                 };
+            }
         }(),
             doc
         /**
-            kweitzel
+         * Gets the current position of an element based on page coordinates.
          * Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
-            doc
+         * @method getXY
-            kweitzel
+         * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM
          * reference, or an Array of IDs and/or HTMLElements
-            doc
+         * @return {Array} The XY position of the element(s)
          */
         getXY: function(el) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._getXY);
-            doc
+        },
             kweitzel
         _canPosition: function(el) {
             return ( Y.Dom._getStyle(el, 'display') !== 'none' && Y.Dom._inDoc(el) );
         },
         _getXY: function() {
             if (document[DOCUMENT_ELEMENT][GET_BOUNDING_CLIENT_RECT]) {
                 return function(node) {
                     var scrollLeft, scrollTop, box, doc,
                         off1, off2, mode, bLeft, bTop,
                         floor = Math.floor, // TODO: round?
                         xy = false;
                     if (Y.Dom._canPosition(node)) {
                         box = node[GET_BOUNDING_CLIENT_RECT]();
                         doc = node[OWNER_DOCUMENT];
                         scrollLeft = Y.Dom.getDocumentScrollLeft(doc);
                         scrollTop = Y.Dom.getDocumentScrollTop(doc);
                         xy = [floor(box[LEFT]), floor(box[TOP])];
                         if (isIE && UA.ie < 8) { // IE < 8: viewport off by 2
                             off1 = 2;
                             off2 = 2;
                             mode = doc[COMPAT_MODE];
                             if (UA.ie === 6) {
                                 if (mode !== _BACK_COMPAT) {
                                     off1 = 0;
                                     off2 = 0;
+                                }
+                            }
                             if ((mode === _BACK_COMPAT)) {
                                 bLeft = _getComputedStyle(doc[DOCUMENT_ELEMENT], BORDER_LEFT_WIDTH);
                                 bTop = _getComputedStyle(doc[DOCUMENT_ELEMENT], BORDER_TOP_WIDTH);
                                 if (bLeft !== MEDIUM) {
                                     off1 = parseInt(bLeft, 10);
+                                }
                                 if (bTop !== MEDIUM) {
                                     off2 = parseInt(bTop, 10);
+                                }
+                            }
                             xy[0] -= off1;
                             xy[1] -= off2;
+                        }
                         if ((scrollTop || scrollLeft)) {
                             xy[0] += scrollLeft;
                             xy[1] += scrollTop;
+                        }
                         // gecko may return sub-pixel (non-int) values
                         xy[0] = floor(xy[0]);
                         xy[1] = floor(xy[1]);
                     } else {
                         YAHOO.log('getXY failed: element not positionable (either not in a document or not displayed)', 'error', 'Dom');
+                    }
                     return xy;
                 };
             } else {
                 return function(node) { // ff2, safari: manually calculate by crawling up offsetParents
                     var docScrollLeft, docScrollTop,
                         scrollTop, scrollLeft,
                         bCheck,
                         xy = false,
                         parentNode = node;
                     if  (Y.Dom._canPosition(node) ) {
                         xy = [node[OFFSET_LEFT], node[OFFSET_TOP]];
                         docScrollLeft = Y.Dom.getDocumentScrollLeft(node[OWNER_DOCUMENT]);
                         docScrollTop = Y.Dom.getDocumentScrollTop(node[OWNER_DOCUMENT]);
                         // TODO: refactor with !! or just falsey
                         bCheck = ((isGecko || UA.webkit > 519) ? true : false);
                         // TODO: worth refactoring for TOP/LEFT only?
                         while ((parentNode = parentNode[OFFSET_PARENT])) {
                             xy[0] += parentNode[OFFSET_LEFT];
                             xy[1] += parentNode[OFFSET_TOP];
                             if (bCheck) {
                                 xy = Y.Dom._calcBorders(parentNode, xy);
+                            }
+                        }
                         // account for any scrolled ancestors
                         if (Y.Dom._getStyle(node, POSITION) !== FIXED) {
                             parentNode = node;
                             while ((parentNode = parentNode[PARENT_NODE]) && parentNode[TAG_NAME]) {
                                 scrollTop = parentNode[SCROLL_TOP];
                                 scrollLeft = parentNode[SCROLL_LEFT];
                                 //Firefox does something funky with borders when overflow is not visible.
                                 if (isGecko && (Y.Dom._getStyle(parentNode, 'overflow') !== 'visible')) {
                                         xy = Y.Dom._calcBorders(parentNode, xy);
+                                }
                                 if (scrollTop || scrollLeft) {
                                     xy[0] -= scrollLeft;
                                     xy[1] -= scrollTop;
+                                }
+                            }
                             xy[0] += docScrollLeft;
                             xy[1] += docScrollTop;
                         } else {
                             //Fix FIXED position -- add scrollbars
                             if (isOpera) {
                                 xy[0] -= docScrollLeft;
                                 xy[1] -= docScrollTop;
                             } else if (isSafari || isGecko) {
                                 xy[0] += docScrollLeft;
                                 xy[1] += docScrollTop;
+                            }
+                        }
                         //Round the numbers so we get sane data back
                         xy[0] = Math.floor(xy[0]);
                         xy[1] = Math.floor(xy[1]);
                     } else {
                         YAHOO.log('getXY failed: element not positionable (either not in a document or not displayed)', 'error', 'Dom');
+                    }
                     return xy;
                 };
+            }
         }(), // NOTE: Executing for loadtime branching
             doc
         /**
          * Gets the current X position of an element based on page coordinates.  The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
          * @method getX
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
          * @return {Number | Array} The X position of the element(s)
          */
         getX: function(el) {
             var f = function(el) {
                 return Y.Dom.getXY(el)[0];
             };
             return Y.Dom.batch(el, f, Y.Dom, true);
         },
         /**
          * Gets the current Y position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
          * @method getY
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
          * @return {Number | Array} The Y position of the element(s)
          */
         getY: function(el) {
             var f = function(el) {
                 return Y.Dom.getXY(el)[1];
             };
             return Y.Dom.batch(el, f, Y.Dom, true);
         },
         /**
          * Set the position of an html element in page coordinates, regardless of how the element is positioned.
          * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
          * @method setXY
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
          * @param {Array} pos Contains X & Y values for new position (coordinates are page-based)
          * @param {Boolean} noRetry By default we try and set the position a second time if the first fails
          */
         setXY: function(el, pos, noRetry) {
-            kweitzel
+            Y.Dom.batch(el, Y.Dom._setXY, { pos: pos, noRetry: noRetry });
         },
             doc
-            kweitzel
+        _setXY: function(node, args) {
             var pos = Y.Dom._getStyle(node, POSITION),
                 setStyle = Y.Dom.setStyle,
                 xy = args.pos,
                 noRetry = args.noRetry,
                 delta = [ // assuming pixels; if not we will have to retry
                     parseInt( Y.Dom.getComputedStyle(node, LEFT), 10 ),
                     parseInt( Y.Dom.getComputedStyle(node, TOP), 10 )
                 ],
                 currentXY,
                 newXY;
             doc
-            kweitzel
+            if (pos == 'static') { // default to relative
                 pos = RELATIVE;
                 setStyle(node, POSITION, pos);
+            }
             doc
-            kweitzel
+            currentXY = Y.Dom._getXY(node);
             if (!xy || currentXY === false) { // has to be part of doc to have xy
                 YAHOO.log('xy failed: node not available', 'error', 'Node');
                 return false;
+            }
             doc
-            kweitzel
+            if ( isNaN(delta[0]) ) {// in case of 'auto'
                 delta[0] = (pos == RELATIVE) ? 0 : node[OFFSET_LEFT];
+            }
             if ( isNaN(delta[1]) ) { // in case of 'auto'
                 delta[1] = (pos == RELATIVE) ? 0 : node[OFFSET_TOP];
+            }
             if (xy[0] !== null) { // from setX
                 setStyle(node, LEFT, xy[0] - currentXY[0] + delta[0] + 'px');
+            }
             if (xy[1] !== null) { // from setY
                 setStyle(node, TOP, xy[1] - currentXY[1] + delta[1] + 'px');
+            }
             if (!noRetry) {
                 newXY = Y.Dom._getXY(node);
                 // if retry is true, try one more time if we miss
                if ( (xy[0] !== null && newXY[0] != xy[0]) ||
                     (xy[1] !== null && newXY[1] != xy[1]) ) {
                    Y.Dom._setXY(node, { pos: xy, noRetry: true });
+               }
+            }
             YAHOO.log('setXY setting position to ' + xy, 'info', 'Node');
-            doc
+        },
         /**
          * Set the X position of an html element in page coordinates, regardless of how the element is positioned.
          * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
          * @method setX
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @param {Int} x The value to use as the X coordinate for the element(s).
          */
         setX: function(el, x) {
             Y.Dom.setXY(el, [x, null]);
         },
         /**
          * Set the Y position of an html element in page coordinates, regardless of how the element is positioned.
          * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
          * @method setY
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @param {Int} x To use as the Y coordinate for the element(s).
          */
         setY: function(el, y) {
             Y.Dom.setXY(el, [null, y]);
         },
         /**
          * Returns the region position of the given element.
          * The element must be part of the DOM tree to have a region (display:none or elements not appended return false).
          * @method getRegion
          * @param {String | HTMLElement | Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
          * @return {Region | Array} A Region or array of Region instances containing "top, left, bottom, right" member data.
          */
         getRegion: function(el) {
             var f = function(el) {
-            kweitzel
+                var region = false;
                 if ( Y.Dom._canPosition(el) ) {
                     region = Y.Region.getRegion(el);
                     YAHOO.log('getRegion returning ' + region, 'info', 'Dom');
                 } else {
                     YAHOO.log('getRegion failed: element not positionable (either not in a document or not displayed)', 'error', 'Dom');
             doc
                 return region;
             };
             return Y.Dom.batch(el, f, Y.Dom, true);
         },
         /**
          * Returns the width of the client (viewport).
          * @method getClientWidth
          * @deprecated Now using getViewportWidth.  This interface left intact for back compat.
          * @return {Int} The width of the viewable area of the page.
          */
         getClientWidth: function() {
             return Y.Dom.getViewportWidth();
         },
         /**
          * Returns the height of the client (viewport).
          * @method getClientHeight
          * @deprecated Now using getViewportHeight.  This interface left intact for back compat.
          * @return {Int} The height of the viewable area of the page.
          */
         getClientHeight: function() {
             return Y.Dom.getViewportHeight();
         },
         /**
-            kweitzel
+         * Returns an array of HTMLElements with the given class.
-            doc
+         * For optimized performance, include a tag and/or root node when possible.
-            kweitzel
+         * Note: This method operates against a live collection, so modifying the
          * collection in the callback (removing/appending nodes, etc.) will have
          * side effects.  Instead you should iterate the returned nodes array,
          * as you would with the native "getElementsByTagName" method.
-            doc
+         * @method getElementsByClassName
          * @param {String} className The class name to match against
          * @param {String} tag (optional) The tag name of the elements being collected
-            kweitzel
+         * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point.
          * This element is not included in the className scan.
-            doc
+         * @param {Function} apply (optional) A function to apply to each element when found
-            kweitzel
+         * @param {Any} o (optional) An optional arg that is passed to the supplied method
          * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
-            doc
+         * @return {Array} An array of elements that have the given class name
          */
-            kweitzel
+        getElementsByClassName: function(className, tag, root, apply, o, overrides) {
-            doc
+            tag = tag || '*';
             root = (root) ? Y.Dom.get(root) : null || document;
             if (!root) {
                 return [];
+            }
             var nodes = [],
                 elements = root.getElementsByTagName(tag),
-            kweitzel
+                hasClass = Y.Dom.hasClass;
             doc
             for (var i = 0, len = elements.length; i < len; ++i) {
-            kweitzel
+                if ( hasClass(elements[i], className) ) {
-            doc
+                    nodes[nodes.length] = elements[i];
+                }
+            }
-            kweitzel
+            if (apply) {
                 Y.Dom.batch(nodes, apply, o, overrides);
+            }
-            doc
+            return nodes;
         },
         /**
          * Determines whether an HTMLElement has the given className.
          * @method hasClass
          * @param {String | HTMLElement | Array} el The element or collection to test
          * @param {String} className the class name to search for
          * @return {Boolean | Array} A boolean value or array of boolean values
          */
         hasClass: function(el, className) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._hasClass, className);
         },
             doc
-            kweitzel
+        _hasClass: function(el, className) {
             var ret = false,
                 current;
             doc
-            kweitzel
+            if (el && className) {
                 current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
                 if (className.exec) {
                     ret = className.test(current);
                 } else {
                     ret = className && (SPACE + current + SPACE).
                         indexOf(SPACE + className + SPACE) > -1;
+                }
             } else {
                 YAHOO.log('hasClass called with invalid arguments', 'warn', 'Dom');
+            }
             return ret;
-            doc
+        },
         /**
          * Adds a class name to a given element or collection of elements.
          * @method addClass
          * @param {String | HTMLElement | Array} el The element or collection to add the class to
          * @param {String} className the class name to add to the class attribute
          * @return {Boolean | Array} A pass/fail boolean or array of booleans
          */
         addClass: function(el, className) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._addClass, className);
         },
         _addClass: function(el, className) {
             var ret = false,
                 current;
             if (el && className) {
                 current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
                 if ( !Y.Dom._hasClass(el, className) ) {
                     Y.Dom.setAttribute(el, CLASS_NAME, trim(current + SPACE + className));
                     ret = true;
             doc
-            kweitzel
+            } else {
                 YAHOO.log('addClass called with invalid arguments', 'warn', 'Dom');
+            }
             return ret;
-            doc
+        },
         /**
          * Removes a class name from a given element or collection of elements.
          * @method removeClass
          * @param {String | HTMLElement | Array} el The element or collection to remove the class from
          * @param {String} className the class name to remove from the class attribute
          * @return {Boolean | Array} A pass/fail boolean or array of booleans
          */
         removeClass: function(el, className) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._removeClass, className);
         },
         _removeClass: function(el, className) {
             var ret = false,
                 current,
                 newClass,
                 attr;
             doc
-            kweitzel
+            if (el && className) {
                 current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
                 Y.Dom.setAttribute(el, CLASS_NAME, current.replace(Y.Dom._getClassRegex(className), EMPTY));
                 newClass = Y.Dom._getAttribute(el, CLASS_NAME);
                 if (current !== newClass) { // else nothing changed
                     Y.Dom.setAttribute(el, CLASS_NAME, trim(newClass)); // trim after comparing to current class
                     ret = true;
                     if (Y.Dom._getAttribute(el, CLASS_NAME) === '') { // remove class attribute if empty
                         attr = (el.hasAttribute && el.hasAttribute(_CLASS)) ? _CLASS : CLASS_NAME;
                         YAHOO.log('removeClass removing empty class attribute', 'info', 'Dom');
                         el.removeAttribute(attr);
+                    }
             doc
-            kweitzel
+            } else {
                 YAHOO.log('removeClass called with invalid arguments', 'warn', 'Dom');
+            }
             return ret;
-            doc
+        },
         /**
          * Replace a class with another class for a given element or collection of elements.
          * If no oldClassName is present, the newClassName is simply added.
          * @method replaceClass
          * @param {String | HTMLElement | Array} el The element or collection to remove the class from
          * @param {String} oldClassName the class name to be replaced
          * @param {String} newClassName the class name that will be replacing the old class name
          * @return {Boolean | Array} A pass/fail boolean or array of booleans
          */
         replaceClass: function(el, oldClassName, newClassName) {
-            kweitzel
+            return Y.Dom.batch(el, Y.Dom._replaceClass, { from: oldClassName, to: newClassName });
         },
             doc
-            kweitzel
+        _replaceClass: function(el, classObj) {
             var className,
                 from,
                 to,
                 ret = false,
                 current;
             doc
-            kweitzel
+            if (el && classObj) {
                 from = classObj.from;
                 to = classObj.to;
                 if (!to) {
                     ret = false;
                 }  else if (!from) { // just add if no "from"
                     ret = Y.Dom._addClass(el, classObj.to);
                 } else if (from !== to) { // else nothing to replace
                     // May need to lead with DBLSPACE?
                     current = Y.Dom._getAttribute(el, CLASS_NAME) || EMPTY;
                     className = (SPACE + current.replace(Y.Dom._getClassRegex(from), SPACE + to)).
                                split(Y.Dom._getClassRegex(to));
                     // insert to into what would have been the first occurrence slot
                     className.splice(1, 0, SPACE + to);
                     Y.Dom.setAttribute(el, CLASS_NAME, trim(className.join(EMPTY)));
                     ret = true;
             doc
-            kweitzel
+            } else {
                 YAHOO.log('replaceClass called with invalid arguments', 'warn', 'Dom');
+            }
             doc
-            kweitzel
+            return ret;
-            doc
+        },
         /**
          * Returns an ID and applies it to the element "el", if provided.
          * @method generateId
          * @param {String | HTMLElement | Array} el (optional) An optional element array of elements to add an ID to (no ID is added if one is already present).
          * @param {String} prefix (optional) an optional prefix to use (defaults to "yui-gen").
          * @return {String | Array} The generated ID, or array of generated IDs (or original ID if already present on an element)
          */
         generateId: function(el, prefix) {
             prefix = prefix || 'yui-gen';
             var f = function(el) {
                 if (el && el.id) { // do not override existing ID
                     YAHOO.log('generateId returning existing id ' + el.id, 'info', 'Dom');
                     return el.id;
             kweitzel
             doc
-            kweitzel
+                var id = prefix + YAHOO.env._id_counter++;
-            doc
+                YAHOO.log('generateId generating ' + id, 'info', 'Dom');
                 if (el) {
-            kweitzel
+                    if (el[OWNER_DOCUMENT] && el[OWNER_DOCUMENT].getElementById(id)) { // in case one already exists
                         // use failed id plus prefix to help ensure uniqueness
                         return Y.Dom.generateId(el, id + prefix);
+                    }
-            doc
+                    el.id = id;
+                }
                 return id;
             };
             // batch fails when no element, so just generate and return single ID
             return Y.Dom.batch(el, f, Y.Dom, true) || f.apply(Y.Dom, arguments);
         },
         /**
          * Determines whether an HTMLElement is an ancestor of another HTML element in the DOM hierarchy.
          * @method isAncestor
          * @param {String | HTMLElement} haystack The possible ancestor
          * @param {String | HTMLElement} needle The possible descendent
          * @return {Boolean} Whether or not the haystack is an ancestor of needle
          */
         isAncestor: function(haystack, needle) {
             haystack = Y.Dom.get(haystack);
             needle = Y.Dom.get(needle);
-            kweitzel
+            var ret = false;
             doc
-            kweitzel
+            if ( (haystack && needle) && (haystack[NODE_TYPE] && needle[NODE_TYPE]) ) {
                 if (haystack.contains && haystack !== needle) { // contains returns true when equal
                     ret = haystack.contains(needle);
+                }
                 else if (haystack.compareDocumentPosition) { // gecko
                     ret = !!(haystack.compareDocumentPosition(needle) & 16);
+                }
             } else {
                 YAHOO.log('isAncestor failed; invalid input: ' + haystack + ',' + needle, 'error', 'Dom');
             doc
-            kweitzel
+            YAHOO.log('isAncestor(' + haystack + ',' + needle + ' returning ' + ret, 'info', 'Dom');
             return ret;
-            doc
+        },
         /**
          * Determines whether an HTMLElement is present in the current document.
          * @method inDocument
          * @param {String | HTMLElement} el The element to search for
-            kweitzel
+         * @param {Object} doc An optional document to search, defaults to element's owner document
-            doc
+         * @return {Boolean} Whether or not the element is present in the current document
          */
-            kweitzel
+        inDocument: function(el, doc) {
             return Y.Dom._inDoc(Y.Dom.get(el), doc);
-            doc
+        },
             kweitzel
         _inDoc: function(el, doc) {
             var ret = false;
             if (el && el[TAG_NAME]) {
                 doc = doc || el[OWNER_DOCUMENT];
                 ret = Y.Dom.isAncestor(doc[DOCUMENT_ELEMENT], el);
             } else {
                 YAHOO.log('inDocument failed: invalid input', 'error', 'Dom');
+            }
             return ret;
         },
             doc
         /**
-            kweitzel
+         * Returns an array of HTMLElements that pass the test applied by supplied boolean method.
-            doc
+         * For optimized performance, include a tag and/or root node when possible.
-            kweitzel
+         * Note: This method operates against a live collection, so modifying the
          * collection in the callback (removing/appending nodes, etc.) will have
          * side effects.  Instead you should iterate the returned nodes array,
          * as you would with the native "getElementsByTagName" method.
-            doc
+         * @method getElementsBy
          * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
          * @param {String} tag (optional) The tag name of the elements being collected
          * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point
          * @param {Function} apply (optional) A function to apply to each element when found
-            kweitzel
+         * @param {Any} o (optional) An optional arg that is passed to the supplied method
          * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
-            doc
+         * @return {Array} Array of HTMLElements
          */
-            kweitzel
+        getElementsBy: function(method, tag, root, apply, o, overrides, firstOnly) {
-            doc
+            tag = tag || '*';
             root = (root) ? Y.Dom.get(root) : null || document;
             if (!root) {
                 return [];
+            }
             var nodes = [],
                 elements = root.getElementsByTagName(tag);
             for (var i = 0, len = elements.length; i < len; ++i) {
                 if ( method(elements[i]) ) {
-            kweitzel
+                    if (firstOnly) {
                         nodes = elements[i];
                         break;
                     } else {
                         nodes[nodes.length] = elements[i];
             doc
+                }
+            }
-            kweitzel
+            if (apply) {
                 Y.Dom.batch(nodes, apply, o, overrides);
+            }
-            doc
+            YAHOO.log('getElementsBy returning ' + nodes, 'info', 'Dom');
             return nodes;
         },
         /**
-            kweitzel
+         * Returns the first HTMLElement that passes the test applied by the supplied boolean method.
          * @method getElementBy
          * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
          * @param {String} tag (optional) The tag name of the elements being collected
          * @param {String | HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point
          * @return {HTMLElement}
          */
         getElementBy: function(method, tag, root) {
             return Y.Dom.getElementsBy(method, tag, root, null, null, null, true);
         },
         /**
-            doc
+         * Runs the supplied method against each item in the Collection/Array.
          * The method is called with the element(s) as the first arg, and the optional param as the second ( method(el, o) ).
          * @method batch
          * @param {String | HTMLElement | Array} el (optional) An element or array of elements to apply the method to
          * @param {Function} method The method to apply to the element(s)
          * @param {Any} o (optional) An optional arg that is passed to the supplied method
-            kweitzel
+         * @param {Boolean} overrides (optional) Whether or not to override the scope of "method" with "o"
-            doc
+         * @return {Any | Array} The return value(s) from the supplied method
          */
-            kweitzel
+        batch: function(el, method, o, overrides) {
             var collection = [],
                 scope = (overrides) ? o : window;
             el = (el && (el[TAG_NAME] || el.item)) ? el : Y.Dom.get(el); // skip get() when possible
             if (el && method) {
                 if (el[TAG_NAME] || el.length === undefined) { // element or not array-like
                     return method.call(scope, el, o);
+                }
             doc
-            kweitzel
+                for (var i = 0; i < el.length; ++i) {
                     collection[collection.length] = method.call(scope, el[i], o);
+                }
             } else {
                 YAHOO.log('batch called with invalid arguments', 'warn', 'Dom');
-            doc
+                return false;
+            }
             return collection;
         },
         /**
          * Returns the height of the document.
          * @method getDocumentHeight
          * @return {Int} The height of the actual document (which includes the body and its margin).
          */
         getDocumentHeight: function() {
-            kweitzel
+            var scrollHeight = (document[COMPAT_MODE] != CSS1_COMPAT || isSafari) ? document.body.scrollHeight : documentElement.scrollHeight,
                 h = Math.max(scrollHeight, Y.Dom.getViewportHeight());
             doc
             YAHOO.log('getDocumentHeight returning ' + h, 'info', 'Dom');
             return h;
         },
         /**
          * Returns the width of the document.
          * @method getDocumentWidth
          * @return {Int} The width of the actual document (which includes the body and its margin).
          */
         getDocumentWidth: function() {
-            kweitzel
+            var scrollWidth = (document[COMPAT_MODE] != CSS1_COMPAT || isSafari) ? document.body.scrollWidth : documentElement.scrollWidth,
                 w = Math.max(scrollWidth, Y.Dom.getViewportWidth());
-            doc
+            YAHOO.log('getDocumentWidth returning ' + w, 'info', 'Dom');
             return w;
         },
         /**
          * Returns the current height of the viewport.
          * @method getViewportHeight
          * @return {Int} The height of the viewable area of the page (excludes scrollbars).
          */
         getViewportHeight: function() {
-            kweitzel
+            var height = self.innerHeight, // Safari, Opera
                 mode = document[COMPAT_MODE];
             doc
             if ( (mode || isIE) && !isOpera ) { // IE, Gecko
-            kweitzel
+                height = (mode == CSS1_COMPAT) ?
                         documentElement.clientHeight : // Standards
-            doc
+                        document.body.clientHeight; // Quirks
+            }
             YAHOO.log('getViewportHeight returning ' + height, 'info', 'Dom');
             return height;
         },
         /**
          * Returns the current width of the viewport.
          * @method getViewportWidth
          * @return {Int} The width of the viewable area of the page (excludes scrollbars).
          */
         getViewportWidth: function() {
-            kweitzel
+            var width = self.innerWidth,  // Safari
                 mode = document[COMPAT_MODE];
             doc
             if (mode || isIE) { // IE, Gecko, Opera
-            kweitzel
+                width = (mode == CSS1_COMPAT) ?
                         documentElement.clientWidth : // Standards
-            doc
+                        document.body.clientWidth; // Quirks
+            }
             YAHOO.log('getViewportWidth returning ' + width, 'info', 'Dom');
             return width;
         },
        /**
          * Returns the nearest ancestor that passes the test applied by supplied boolean method.
          * For performance reasons, IDs are not accepted and argument validation omitted.
          * @method getAncestorBy
          * @param {HTMLElement} node The HTMLElement to use as the starting point
          * @param {Function} method - A boolean method for testing elements which receives the element as its only argument.
          * @return {Object} HTMLElement or null if not found
          */
         getAncestorBy: function(node, method) {
-            kweitzel
+            while ( (node = node[PARENT_NODE]) ) { // NOTE: assignment
                 if ( Y.Dom._testElement(node, method) ) {
-            doc
+                    YAHOO.log('getAncestorBy returning ' + node, 'info', 'Dom');
                     return node;
+                }
+            }
             YAHOO.log('getAncestorBy returning null (no ancestor passed test)', 'error', 'Dom');
             return null;
         },
         /**
          * Returns the nearest ancestor with the given className.
          * @method getAncestorByClassName
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @param {String} className
          * @return {Object} HTMLElement
          */
         getAncestorByClassName: function(node, className) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getAncestorByClassName failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
             var method = function(el) { return Y.Dom.hasClass(el, className); };
             return Y.Dom.getAncestorBy(node, method);
         },
         /**
          * Returns the nearest ancestor with the given tagName.
          * @method getAncestorByTagName
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @param {String} tagName
          * @return {Object} HTMLElement
          */
         getAncestorByTagName: function(node, tagName) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getAncestorByTagName failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
             var method = function(el) {
-            kweitzel
+                 return el[TAG_NAME] && el[TAG_NAME].toUpperCase() == tagName.toUpperCase();
-            doc
+            };
             return Y.Dom.getAncestorBy(node, method);
         },
         /**
          * Returns the previous sibling that is an HTMLElement.
          * For performance reasons, IDs are not accepted and argument validation omitted.
          * Returns the nearest HTMLElement sibling if no method provided.
          * @method getPreviousSiblingBy
          * @param {HTMLElement} node The HTMLElement to use as the starting point
          * @param {Function} method A boolean function used to test siblings
          * that receives the sibling node being tested as its only argument
          * @return {Object} HTMLElement or null if not found
          */
         getPreviousSiblingBy: function(node, method) {
             while (node) {
                 node = node.previousSibling;
-            kweitzel
+                if ( Y.Dom._testElement(node, method) ) {
-            doc
+                    return node;
+                }
+            }
             return null;
         },
         /**
          * Returns the previous sibling that is an HTMLElement
          * @method getPreviousSibling
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @return {Object} HTMLElement or null if not found
          */
         getPreviousSibling: function(node) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getPreviousSibling failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
             return Y.Dom.getPreviousSiblingBy(node);
         },
         /**
          * Returns the next HTMLElement sibling that passes the boolean method.
          * For performance reasons, IDs are not accepted and argument validation omitted.
          * Returns the nearest HTMLElement sibling if no method provided.
          * @method getNextSiblingBy
          * @param {HTMLElement} node The HTMLElement to use as the starting point
          * @param {Function} method A boolean function used to test siblings
          * that receives the sibling node being tested as its only argument
          * @return {Object} HTMLElement or null if not found
          */
         getNextSiblingBy: function(node, method) {
             while (node) {
                 node = node.nextSibling;
-            kweitzel
+                if ( Y.Dom._testElement(node, method) ) {
-            doc
+                    return node;
+                }
+            }
             return null;
         },
         /**
          * Returns the next sibling that is an HTMLElement
          * @method getNextSibling
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @return {Object} HTMLElement or null if not found
          */
         getNextSibling: function(node) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getNextSibling failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
             return Y.Dom.getNextSiblingBy(node);
         },
         /**
          * Returns the first HTMLElement child that passes the test method.
          * @method getFirstChildBy
          * @param {HTMLElement} node The HTMLElement to use as the starting point
          * @param {Function} method A boolean function used to test children
          * that receives the node being tested as its only argument
          * @return {Object} HTMLElement or null if not found
          */
         getFirstChildBy: function(node, method) {
-            kweitzel
+            var child = ( Y.Dom._testElement(node.firstChild, method) ) ? node.firstChild : null;
-            doc
+            return child || Y.Dom.getNextSiblingBy(node.firstChild, method);
         },
         /**
          * Returns the first HTMLElement child.
          * @method getFirstChild
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @return {Object} HTMLElement or null if not found
          */
         getFirstChild: function(node, method) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getFirstChild failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
             return Y.Dom.getFirstChildBy(node);
         },
         /**
          * Returns the last HTMLElement child that passes the test method.
          * @method getLastChildBy
          * @param {HTMLElement} node The HTMLElement to use as the starting point
          * @param {Function} method A boolean function used to test children
          * that receives the node being tested as its only argument
          * @return {Object} HTMLElement or null if not found
          */
         getLastChildBy: function(node, method) {
             if (!node) {
                 YAHOO.log('getLastChild failed: invalid node argument', 'error', 'Dom');
                 return null;
+            }
-            kweitzel
+            var child = ( Y.Dom._testElement(node.lastChild, method) ) ? node.lastChild : null;
-            doc
+            return child || Y.Dom.getPreviousSiblingBy(node.lastChild, method);
         },
         /**
          * Returns the last HTMLElement child.
          * @method getLastChild
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @return {Object} HTMLElement or null if not found
          */
         getLastChild: function(node) {
             node = Y.Dom.get(node);
             return Y.Dom.getLastChildBy(node);
         },
         /**
          * Returns an array of HTMLElement childNodes that pass the test method.
          * @method getChildrenBy
          * @param {HTMLElement} node The HTMLElement to start from
          * @param {Function} method A boolean function used to test children
          * that receives the node being tested as its only argument
          * @return {Array} A static array of HTMLElements
          */
         getChildrenBy: function(node, method) {
-            kweitzel
+            var child = Y.Dom.getFirstChildBy(node, method),
                 children = child ? [child] : [];
             doc
             Y.Dom.getNextSiblingBy(child, function(node) {
                 if ( !method || method(node) ) {
                     children[children.length] = node;
+                }
                 return false; // fail test to collect all children
             });
             return children;
         },
         /**
          * Returns an array of HTMLElement childNodes.
          * @method getChildren
          * @param {String | HTMLElement} node The HTMLElement or an ID to use as the starting point
          * @return {Array} A static array of HTMLElements
          */
         getChildren: function(node) {
             node = Y.Dom.get(node);
             if (!node) {
                 YAHOO.log('getChildren failed: invalid node argument', 'error', 'Dom');
+            }
             return Y.Dom.getChildrenBy(node);
         },
             kweitzel
-            doc
+        /**
          * Returns the left scroll value of the document
          * @method getDocumentScrollLeft
          * @param {HTMLDocument} document (optional) The document to get the scroll value of
          * @return {Int}  The amount that the document is scrolled to the left
          */
         getDocumentScrollLeft: function(doc) {
             doc = doc || document;
-            kweitzel
+            return Math.max(doc[DOCUMENT_ELEMENT].scrollLeft, doc.body.scrollLeft);
-            doc
+        },
         /**
          * Returns the top scroll value of the document
          * @method getDocumentScrollTop
          * @param {HTMLDocument} document (optional) The document to get the scroll value of
          * @return {Int}  The amount that the document is scrolled to the top
          */
         getDocumentScrollTop: function(doc) {
             doc = doc || document;
-            kweitzel
+            return Math.max(doc[DOCUMENT_ELEMENT].scrollTop, doc.body.scrollTop);
-            doc
+        },
         /**
          * Inserts the new node as the previous sibling of the reference node
          * @method insertBefore
          * @param {String | HTMLElement} newNode The node to be inserted
          * @param {String | HTMLElement} referenceNode The node to insert the new node before
          * @return {HTMLElement} The node that was inserted (or null if insert fails)
          */
         insertBefore: function(newNode, referenceNode) {
             newNode = Y.Dom.get(newNode);
             referenceNode = Y.Dom.get(referenceNode);
-            kweitzel
+            if (!newNode || !referenceNode || !referenceNode[PARENT_NODE]) {
-            doc
+                YAHOO.log('insertAfter failed: missing or invalid arg(s)', 'error', 'Dom');
                 return null;
+            }
-            kweitzel
+            return referenceNode[PARENT_NODE].insertBefore(newNode, referenceNode);
-            doc
+        },
         /**
          * Inserts the new node as the next sibling of the reference node
          * @method insertAfter
          * @param {String | HTMLElement} newNode The node to be inserted
          * @param {String | HTMLElement} referenceNode The node to insert the new node after
          * @return {HTMLElement} The node that was inserted (or null if insert fails)
          */
         insertAfter: function(newNode, referenceNode) {
             newNode = Y.Dom.get(newNode);
             referenceNode = Y.Dom.get(referenceNode);
-            kweitzel
+            if (!newNode || !referenceNode || !referenceNode[PARENT_NODE]) {
-            doc
+                YAHOO.log('insertAfter failed: missing or invalid arg(s)', 'error', 'Dom');
                 return null;
+            }
             if (referenceNode.nextSibling) {
-            kweitzel
+                return referenceNode[PARENT_NODE].insertBefore(newNode, referenceNode.nextSibling);
-            doc
+            } else {
-            kweitzel
+                return referenceNode[PARENT_NODE].appendChild(newNode);
             doc
         },
         /**
          * Creates a Region based on the viewport relative to the document.
          * @method getClientRegion
          * @return {Region} A Region object representing the viewport which accounts for document scroll
          */
         getClientRegion: function() {
             var t = Y.Dom.getDocumentScrollTop(),
                 l = Y.Dom.getDocumentScrollLeft(),
                 r = Y.Dom.getViewportWidth() + l,
                 b = Y.Dom.getViewportHeight() + t;
             return new Y.Region(t, r, b, l);
-            kweitzel
+        },
             doc
-            kweitzel
+        /**
          * Provides a normalized attribute interface.
          * @method setAttribute
          * @param {String | HTMLElement} el The target element for the attribute.
          * @param {String} attr The attribute to set.
          * @param {String} val The value of the attribute.
          */
         setAttribute: function(el, attr, val) {
             Y.Dom.batch(el, Y.Dom._setAttribute, { attr: attr, val: val });
         },
             doc
-            kweitzel
+        _setAttribute: function(el, args) {
             var attr = Y.Dom._toCamel(args.attr),
                 val = args.val;
             doc
-            kweitzel
+            if (el && el.setAttribute) {
                 if (Y.Dom.DOT_ATTRIBUTES[attr]) {
                     el[attr] = val;
                 } else {
                     attr = Y.Dom.CUSTOM_ATTRIBUTES[attr] || attr;
                     el.setAttribute(attr, val);
             doc
-            kweitzel
+            } else {
                 YAHOO.log('setAttribute method not available for ' + el, 'error', 'Dom');
+            }
         },
             doc
-            kweitzel
+        /**
          * Provides a normalized attribute interface.
          * @method getAttribute
          * @param {String | HTMLElement} el The target element for the attribute.
          * @param {String} attr The attribute to get.
          * @return {String} The current value of the attribute.
          */
         getAttribute: function(el, attr) {
             return Y.Dom.batch(el, Y.Dom._getAttribute, attr);
         },
             doc
             kweitzel
         _getAttribute: function(el, attr) {
             var val;
             attr = Y.Dom.CUSTOM_ATTRIBUTES[attr] || attr;
             if (el && el.getAttribute) {
                 val = el.getAttribute(attr, 2);
             } else {
                 YAHOO.log('getAttribute method not available for ' + el, 'error', 'Dom');
+            }
             return val;
         },
         _toCamel: function(property) {
             var c = propertyCache;
             function tU(x,l) {
                 return l.toUpperCase();
+            }
             return c[property] || (c[property] = property.indexOf('-') === -1 ?
                                     property :
                                     property.replace( /-([a-z])/gi, tU ));
         },
         _getClassRegex: function(className) {
             var re;
             if (className !== undefined) { // allow empty string to pass
                 if (className.exec) { // already a RegExp
                     re = className;
                 } else {
                     re = reCache[className];
                     if (!re) {
                         // escape special chars (".", "[", etc.)
                         className = className.replace(Y.Dom._patterns.CLASS_RE_TOKENS, '\\$1');
                         re = reCache[className] = new RegExp(C_START + className + C_END, G);
             doc
+                }
             kweitzel
             return re;
         },
             doc
-            kweitzel
+        _patterns: {
             ROOT_TAG: /^body|html$/i, // body for quirks mode, html for standards,
             CLASS_RE_TOKENS: /([\.\(\)\^\$\*\+\?\|\[\]\{\}\\])/g
         },
         _testElement: function(node, method) {
             return node && node[NODE_TYPE] == 1 && ( !method || method(node) );
         },
         _calcBorders: function(node, xy2) {
             var t = parseInt(Y.Dom[GET_COMPUTED_STYLE](node, BORDER_TOP_WIDTH), 10) || 0,
                 l = parseInt(Y.Dom[GET_COMPUTED_STYLE](node, BORDER_LEFT_WIDTH), 10) || 0;
             if (isGecko) {
                 if (RE_TABLE.test(node[TAG_NAME])) {
                     t = 0;
                     l = 0;
+                }
+            }
             xy2[0] += l;
             xy2[1] += t;
             return xy2;
             doc
-            kweitzel
+    };
     var _getComputedStyle = Y.Dom[GET_COMPUTED_STYLE];
     // fix opera computedStyle default color unit (convert to rgb)
     if (UA.opera) {
         Y.Dom[GET_COMPUTED_STYLE] = function(node, att) {
             var val = _getComputedStyle(node, att);
             if (RE_COLOR.test(att)) {
                 val = Y.Dom.Color.toRGB(val);
+            }
             return val;
         };
+    }
     // safari converts transparent to rgba(), others use "transparent"
     if (UA.webkit) {
         Y.Dom[GET_COMPUTED_STYLE] = function(node, att) {
             var val = _getComputedStyle(node, att);
             if (val === 'rgba(0, 0, 0, 0)') {
                 val = 'transparent';
+            }
             return val;
         };
+    }
     if (UA.ie && UA.ie >= 8 && document.documentElement.hasAttribute) { // IE 8 standards
         Y.Dom.DOT_ATTRIBUTES.type = true; // IE 8 errors on input.setAttribute('type')
+    }
-            doc
+})();
 /**
  * A region is a representation of an object on a grid.  It is defined
  * by the top, right, bottom, left extents, so is rectangular by default.  If
  * other shapes are required, this class could be extended to support it.
  * @namespace YAHOO.util
  * @class Region
  * @param {Int} t the top extent
  * @param {Int} r the right extent
  * @param {Int} b the bottom extent
  * @param {Int} l the left extent
  * @constructor
  */
 YAHOO.util.Region = function(t, r, b, l) {
     /**
      * The region's top extent
      * @property top
      * @type Int
      */
     this.top = t;
     /**
-            kweitzel
+     * The region's top extent
      * @property y
      * @type Int
      */
     this.y = t;
     /**
-            doc
+     * The region's top extent as index, for symmetry with set/getXY
      * @property 1
      * @type Int
      */
     this[1] = t;
     /**
      * The region's right extent
      * @property right
      * @type int
      */
     this.right = r;
     /**
      * The region's bottom extent
      * @property bottom
      * @type Int
      */
     this.bottom = b;
     /**
      * The region's left extent
      * @property left
      * @type Int
      */
     this.left = l;
     /**
-            kweitzel
+     * The region's left extent
      * @property x
      * @type Int
      */
     this.x = l;
     /**
-            doc
+     * The region's left extent as index, for symmetry with set/getXY
      * @property 0
      * @type Int
      */
     this[0] = l;
             kweitzel
     /**
      * The region's total width
      * @property width
      * @type Int
      */
     this.width = this.right - this.left;
     /**
      * The region's total height
      * @property height
      * @type Int
      */
     this.height = this.bottom - this.top;
-            doc
+};
 /**
  * Returns true if this region contains the region passed in
  * @method contains
  * @param  {Region}  region The region to evaluate
  * @return {Boolean}        True if the region is contained with this region,
  *                          else false
  */
 YAHOO.util.Region.prototype.contains = function(region) {
     return ( region.left   >= this.left   &&
              region.right  <= this.right  &&
              region.top    >= this.top    &&
              region.bottom <= this.bottom    );
     // this.logger.debug("does " + this + " contain " + region + " ... " + ret);
 };
 /**
  * Returns the area of the region
  * @method getArea
  * @return {Int} the region's area
  */
 YAHOO.util.Region.prototype.getArea = function() {
     return ( (this.bottom - this.top) * (this.right - this.left) );
 };
 /**
  * Returns the region where the passed in region overlaps with this one
  * @method intersect
  * @param  {Region} region The region that intersects
  * @return {Region}        The overlap region, or null if there is no overlap
  */
 YAHOO.util.Region.prototype.intersect = function(region) {
-            kweitzel
+    var t = Math.max( this.top,    region.top    ),
         r = Math.min( this.right,  region.right  ),
         b = Math.min( this.bottom, region.bottom ),
         l = Math.max( this.left,   region.left   );
             doc
     if (b >= t && r >= l) {
         return new YAHOO.util.Region(t, r, b, l);
     } else {
         return null;
+    }
 };
 /**
  * Returns the region representing the smallest region that can contain both
  * the passed in region and this region.
  * @method union
  * @param  {Region} region The region that to create the union with
  * @return {Region}        The union region
  */
 YAHOO.util.Region.prototype.union = function(region) {
-            kweitzel
+    var t = Math.min( this.top,    region.top    ),
         r = Math.max( this.right,  region.right  ),
         b = Math.max( this.bottom, region.bottom ),
         l = Math.min( this.left,   region.left   );
             doc
     return new YAHOO.util.Region(t, r, b, l);
 };
 /**
  * toString
  * @method toString
  * @return string the region properties
  */
 YAHOO.util.Region.prototype.toString = function() {
     return ( "Region {"    +
              "top: "       + this.top    +
              ", right: "   + this.right  +
              ", bottom: "  + this.bottom +
              ", left: "    + this.left   +
-            kweitzel
+             ", height: "  + this.height +
              ", width: "    + this.width   +
-            doc
+             "}" );
 };
 /**
  * Returns a region that is occupied by the DOM element
  * @method getRegion
  * @param  {HTMLElement} el The element
  * @return {Region}         The region that the element occupies
  * @static
  */
 YAHOO.util.Region.getRegion = function(el) {
-            kweitzel
+    var p = YAHOO.util.Dom.getXY(el),
         t = p[1],
         r = p[0] + el.offsetWidth,
         b = p[1] + el.offsetHeight,
         l = p[0];
             doc
     return new YAHOO.util.Region(t, r, b, l);
 };
 /////////////////////////////////////////////////////////////////////////////
 /**
  * A point is a region that is special in that it represents a single point on
  * the grid.
  * @namespace YAHOO.util
  * @class Point
  * @param {Int} x The X position of the point
  * @param {Int} y The Y position of the point
  * @constructor
  * @extends YAHOO.util.Region
  */
 YAHOO.util.Point = function(x, y) {
    if (YAHOO.lang.isArray(x)) { // accept input from Dom.getXY, Event.getXY, etc.
       y = x[1]; // dont blow away x yet
       x = x[0];
+   }
             kweitzel
     YAHOO.util.Point.superclass.constructor.call(this, y, x, y, x);
-            doc
+};
-            kweitzel
+YAHOO.extend(YAHOO.util.Point, YAHOO.util.Region);
             doc
-            kweitzel
+(function() {
 /**
  * Add style management functionality to DOM.
  * @module dom
  * @for Dom
  */
 var Y = YAHOO.util,
     CLIENT_TOP = 'clientTop',
     CLIENT_LEFT = 'clientLeft',
     PARENT_NODE = 'parentNode',
     RIGHT = 'right',
     HAS_LAYOUT = 'hasLayout',
     PX = 'px',
     OPACITY = 'opacity',
     AUTO = 'auto',
     BORDER_LEFT_WIDTH = 'borderLeftWidth',
     BORDER_TOP_WIDTH = 'borderTopWidth',
     BORDER_RIGHT_WIDTH = 'borderRightWidth',
     BORDER_BOTTOM_WIDTH = 'borderBottomWidth',
     VISIBLE = 'visible',
     TRANSPARENT = 'transparent',
     HEIGHT = 'height',
     WIDTH = 'width',
     STYLE = 'style',
     CURRENT_STYLE = 'currentStyle',
 // IE getComputedStyle
 // TODO: unit-less lineHeight (e.g. 1.22)
     re_size = /^width|height$/,
     re_unit = /^(\d[.\d]*)+(em|ex|px|gd|rem|vw|vh|vm|ch|mm|cm|in|pt|pc|deg|rad|ms|s|hz|khz|%){1}?/i,
     ComputedStyle = {
         get: function(el, property) {
             var value = '',
                 current = el[CURRENT_STYLE][property];
             if (property === OPACITY) {
                 value = Y.Dom.getStyle(el, OPACITY);
             } else if (!current || (current.indexOf && current.indexOf(PX) > -1)) { // no need to convert
                 value = current;
             } else if (Y.Dom.IE_COMPUTED[property]) { // use compute function
                 value = Y.Dom.IE_COMPUTED[property](el, property);
             } else if (re_unit.test(current)) { // convert to pixel
                 value = Y.Dom.IE.ComputedStyle.getPixel(el, property);
             } else {
                 value = current;
+            }
             return value;
         },
         getOffset: function(el, prop) {
             var current = el[CURRENT_STYLE][prop],                        // value of "width", "top", etc.
                 capped = prop.charAt(0).toUpperCase() + prop.substr(1), // "Width", "Top", etc.
                 offset = 'offset' + capped,                             // "offsetWidth", "offsetTop", etc.
                 pixel = 'pixel' + capped,                               // "pixelWidth", "pixelTop", etc.
                 value = '',
                 actual;
             if (current == AUTO) {
                 actual = el[offset]; // offsetHeight/Top etc.
                 if (actual === undefined) { // likely "right" or "bottom"
                     value = 0;
+                }
                 value = actual;
                 if (re_size.test(prop)) { // account for box model diff
                     el[STYLE][prop] = actual;
                     if (el[offset] > actual) {
                         // the difference is padding + border (works in Standards & Quirks modes)
                         value = actual - (el[offset] - actual);
+                    }
                     el[STYLE][prop] = AUTO; // revert to auto
+                }
             } else { // convert units to px
                 if (!el[STYLE][pixel] && !el[STYLE][prop]) { // need to map style.width to currentStyle (no currentStyle.pixelWidth)
                     el[STYLE][prop] = current;              // no style.pixelWidth if no style.width
+                }
                 value = el[STYLE][pixel];
+            }
             return value + PX;
         },
         getBorderWidth: function(el, property) {
             // clientHeight/Width = paddingBox (e.g. offsetWidth - borderWidth)
             // clientTop/Left = borderWidth
             var value = null;
             if (!el[CURRENT_STYLE][HAS_LAYOUT]) { // TODO: unset layout?
                 el[STYLE].zoom = 1; // need layout to measure client
+            }
             switch(property) {
                 case BORDER_TOP_WIDTH:
                     value = el[CLIENT_TOP];
                     break;
                 case BORDER_BOTTOM_WIDTH:
                     value = el.offsetHeight - el.clientHeight - el[CLIENT_TOP];
                     break;
                 case BORDER_LEFT_WIDTH:
                     value = el[CLIENT_LEFT];
                     break;
                 case BORDER_RIGHT_WIDTH:
                     value = el.offsetWidth - el.clientWidth - el[CLIENT_LEFT];
                     break;
+            }
             return value + PX;
         },
         getPixel: function(node, att) {
             // use pixelRight to convert to px
             var val = null,
                 styleRight = node[CURRENT_STYLE][RIGHT],
                 current = node[CURRENT_STYLE][att];
             node[STYLE][RIGHT] = current;
             val = node[STYLE].pixelRight;
             node[STYLE][RIGHT] = styleRight; // revert
             return val + PX;
         },
         getMargin: function(node, att) {
             var val;
             if (node[CURRENT_STYLE][att] == AUTO) {
                 val = 0 + PX;
             } else {
                 val = Y.Dom.IE.ComputedStyle.getPixel(node, att);
+            }
             return val;
         },
         getVisibility: function(node, att) {
             var current;
             while ( (current = node[CURRENT_STYLE]) && current[att] == 'inherit') { // NOTE: assignment in test
                 node = node[PARENT_NODE];
+            }
             return (current) ? current[att] : VISIBLE;
         },
         getColor: function(node, att) {
             return Y.Dom.Color.toRGB(node[CURRENT_STYLE][att]) || TRANSPARENT;
         },
         getBorderColor: function(node, att) {
             var current = node[CURRENT_STYLE],
                 val = current[att] || current.color;
             return Y.Dom.Color.toRGB(Y.Dom.Color.toHex(val));
+        }
     },
 //fontSize: getPixelFont,
     IEComputed = {};
 IEComputed.top = IEComputed.right = IEComputed.bottom = IEComputed.left =
         IEComputed[WIDTH] = IEComputed[HEIGHT] = ComputedStyle.getOffset;
 IEComputed.color = ComputedStyle.getColor;
 IEComputed[BORDER_TOP_WIDTH] = IEComputed[BORDER_RIGHT_WIDTH] =
         IEComputed[BORDER_BOTTOM_WIDTH] = IEComputed[BORDER_LEFT_WIDTH] =
         ComputedStyle.getBorderWidth;
 IEComputed.marginTop = IEComputed.marginRight = IEComputed.marginBottom =
         IEComputed.marginLeft = ComputedStyle.getMargin;
 IEComputed.visibility = ComputedStyle.getVisibility;
 IEComputed.borderColor = IEComputed.borderTopColor =
         IEComputed.borderRightColor = IEComputed.borderBottomColor =
         IEComputed.borderLeftColor = ComputedStyle.getBorderColor;
 Y.Dom.IE_COMPUTED = IEComputed;
 Y.Dom.IE_ComputedStyle = ComputedStyle;
 })();
 (function() {
 /**
  * Add style management functionality to DOM.
  * @module dom
  * @for Dom
  */
 var TO_STRING = 'toString',
     PARSE_INT = parseInt,
     RE = RegExp,
     Y = YAHOO.util;
 Y.Dom.Color = {
     KEYWORDS: {
         black: '000',
         silver: 'c0c0c0',
         gray: '808080',
         white: 'fff',
         maroon: '800000',
         red: 'f00',
         purple: '800080',
         fuchsia: 'f0f',
         green: '008000',
         lime: '0f0',
         olive: '808000',
         yellow: 'ff0',
         navy: '000080',
         blue: '00f',
         teal: '008080',
         aqua: '0ff'
     },
     re_RGB: /^rgb\(([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)\)$/i,
     re_hex: /^#?([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})$/i,
     re_hex3: /([0-9A-F])/gi,
     toRGB: function(val) {
         if (!Y.Dom.Color.re_RGB.test(val)) {
             val = Y.Dom.Color.toHex(val);
+        }
         if(Y.Dom.Color.re_hex.exec(val)) {
             val = 'rgb(' + [
                 PARSE_INT(RE.$1, 16),
                 PARSE_INT(RE.$2, 16),
                 PARSE_INT(RE.$3, 16)
             ].join(', ') + ')';
+        }
         return val;
     },
     toHex: function(val) {
         val = Y.Dom.Color.KEYWORDS[val] || val;
         if (Y.Dom.Color.re_RGB.exec(val)) {
             var r = (RE.$1.length === 1) ? '0' + RE.$1 : Number(RE.$1),
                 g = (RE.$2.length === 1) ? '0' + RE.$2 : Number(RE.$2),
                 b = (RE.$3.length === 1) ? '0' + RE.$3 : Number(RE.$3);
             val = [
                 r[TO_STRING](16),
                 g[TO_STRING](16),
                 b[TO_STRING](16)
             ].join('');
+        }
         if (val.length < 6) {
             val = val.replace(Y.Dom.Color.re_hex3, '$1$1');
+        }
         if (val !== 'transparent' && val.indexOf('#') < 0) {
             val = '#' + val;
+        }
         return val.toLowerCase();
+    }
 };
 }());
 YAHOO.register("dom", YAHOO.util.Dom, {version: "2.8.0r4", build: "2449"});