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