$(function() {
	$('.rollover').hover(function() {
	var currentImg = $(this).attr('src');
	var newImg = currentImg.split('.');
	newImg = newImg[0] + '-hover.' + newImg[1];
	$(this).attr('src', newImg);
	}, 
	function() {
	var currentImg = $(this).attr('src');
	var newImg = currentImg.split('-hover.');
	newImg = newImg[0] + '.' + newImg[1];
	$(this).attr('src', newImg);
	});
});