Using an element with a background-image, you can specify data-rollover="http://" to specify a rollover image.

data-rollover.js

  $(document).ready(function() {
		$('.rollover').each(function() {
			var rollover = $(this).data('rollover');
			var original = $(this).css('background-image');
			$(this).hover(
				function() {
					$(this).css('background-image', 'url('+rollover+')');
				},
				function() {
					$(this).css('background-image', original);					
				})
		});
	});