// JavaScript Document
var rO = {
	 addEvent: function(elm, evType, fn, useCapture) {
			// addEvent cross-browser event handling for IE5+, NS6 and Mozilla
			// By Scott Andrew
			if (elm.addEventListener) {
			  elm.addEventListener(evType, fn, useCapture); 
			  return true;
			} else if (elm.attachEvent) {
			  var r = elm.attachEvent('on' + evType, fn);
			  return r;
			} else {
			  elm['on' + evType] = fn;
			}
	  },
	  init: function(){
			if(!document.getElementsByTagName)
				return;
			var all_links = document.getElementsByTagName('a');
			for(var i = 0; i < all_links.length; i++){
				var link = all_links[i];
				if(link.className && (' ' + link.className + ' ').indexOf(' rollover ') != -1){
					if(link.childNodes && link.childNodes.length == 1 && link.childNodes[0].nodeName.toLowerCase() == 'img'){
							rO.addEvent(link,'mouseover',rO.mouseover,false);
							rO.addEvent(link,'mouseout',rO.mouseout,false);
					}
				}
			}  
	  },
	  mouseover: function (e){
			var target = rO.findTarget(e);
			if(!target) return;
			
			// the only child node of the a-tag in target will be an img-tag
			var img_tag = target.childNodes[0];
			
			// Take the "src", which name an image called "something.ext",
			// Make it point to "something_over.ext"
			// This is done with a regular expression
			img_tag.src = img_tag.src.replace(/(\.[^.]+)$/, '_over$1');
	  },
	  mouseout: function (e){
			var target = rO.findTarget(e);
			if(!target) return;
			
			// the only child node of the a-tag in target will be an img-tag
			var img_tag = target.childNodes[0];
			
			// Take the "src", which name an image as "something_over.ext",
			// Make it point to "something.ext"
			// This is done with a regular expression
			img_tag.src = img_tag.src.replace(/_over(\.[^.]+)$/, '$1');
	  },
	  findTarget: function (e){
			/* Begin the DOM events part, which you
				can ignore for now if it's confusing*/
			var target;
			
			if(window.event && window.event.srcElement)
				target = window.event.srcElement;
			else if(e && e.target)
				target = e.target;
			if(!target)
				return null;
				
			while(target != document.body && target.nodeName.toLowerCase() != 'a')
				target = target.parentNode;
			
			if(target.nodeName.toLowerCase() != 'a')
				return null;
				
			return target;
	   }  
}
rO.addEvent(window,'load',rO.init,false);