EventDispenser = Class.create();
	EventDispenser.prototype = {
	  initialize: function(list) {
	  	
	  	this.list = list;
		
		Event.observe(window, 'load', this.pageLoad.bindAsEventListener(this));
	
	  },
	
	
	 pageLoad: function(event) {
	 	$$(this.list + " img.mainnav").each(function(item) {
	 		if (item.src.indexOf('_f2') == -1 ) {
			 	Event.observe(item, 'mouseover', this.setImgOver.bindAsEventListener(this));
			 	Event.observe(item, 'mouseout', this.setImgOut.bindAsEventListener(this));
			}
		}.bind(this));

	  },
  
	  
	  setImgOver: function(event) {
	  	el = Event.element(event);
		img=eval(el.id + "on.src");
		$(el.id).src = img;
	  },
	  
	  setImgOut: function(event) {
	  	el = Event.element(event);
		img=eval(el.id + "off.src");
		$(el.id).src = img;
	  }
	  
	  	  
	}
	
	new EventDispenser('div#mainnav');