// JavaScript Document
    window.addEvent('domready',function(){
        $$('#custom_top_icons a').each(function(element, index){
            element.addEvents({
                'mouseover': function (){
                    this.set('src',  this.get('src').replace('.gif','_over.gif') );
                }.bind(element.getFirst('img')),
                'mouseout': function(){
                    this.set('src',  this.get('src').replace('_over.gif','.gif') );
                }.bind(element.getFirst('img'))
            });
        });
    });