$(function(){
	$("img.rollover").live("mouseover",function(){
		 $(this).attr("src",$(this).attr("src").replace(/^(.+)(\.[a-z]+)$/, "$1_on$2"));
	});
	$("img.rollover").live("mouseout",function(){
		 $(this).attr("src",$(this).attr("src").replace(/^(.+)_on(\.[a-z]+)$/, "$1$2"));
	});
})