// JavaScript Document - rollover.js

var rollover ={
	rollOn: function(){
            
                  this.src = this.src.replace('.gif', '_active.gif');
              this.src = this.src.replace('.png', '_active.png');
        },

      rollOff:function(){
        
                 this.src = this.src.replace('_active', '');
          
     },

     init: function(){
              $$('.nav a img').each(function(el){
                                 if( !el.src.contains('_active') ){
                                    el.addEvent('mouseover', rollover.rollOn);
                                    el.addEvent('mouseout', rollover.rollOff);
                                 }                               
            });
     }
}
	
	
window.addEvent('domready', rollover.init);