//:Get a random image from a folder in the MEDIA folder.
//:Commandline to use: [[RandomImage?dir=subfolder_in_mediafolder]]
$folder=opendir(WB_PATH.MEDIA_DIRECTORY.'/'.$dir.'/.'); 
$names = array();
while ($file = readdir($folder))  {
	$ext=strtolower(substr($file,-4));
	if ($ext==".jpg"||$ext==".gif"||$ext==".png"){
		$names[count($names)] = $file; 
	}
}
closedir($folder);
shuffle($names);
$image=$names[0]; 
$name=substr($image,0,-4);
return '<img src="'.WB_URL.MEDIA_DIRECTORY.'/'.$dir.'/'.$image.'" alt="'.$name.'" width="'.$width.'" height="'.$height.'"/>';