$(document).ready(function(){
	
	// equal div lengths 
    var biggestHeight = 0;  
    $('.equal_height').each(function(){  
         if($(this).height() > biggestHeight){  
 			biggestHeight = $(this).height();  
         }  
    });  
    $('.equal_height').height(biggestHeight);
	 
	// nav rollovers
	$("img.rollover").hover(
 		function()
 		{
  			this.src = this.src.replace("_off","_on");
 		},
 		function()
 		{
  			this.src = this.src.replace("_on","_off");
 		}
	);	
 });