$(document).ready(function() {

	$('.link-rollover').mouseover(function() {
		$rollover_img_src = $(this).attr('data-rolloverimg');
		$(this).attr('data-normalimg', $(this).attr('src'));
		$(this).attr('src', $rollover_img_src);
	});
	
	$('.link-rollover').mouseout(function() {
		$normal_img_src = $(this).attr('data-normalimg');
		$(this).attr('src', $normal_img_src);
	});
	
	$('.backbutton').click(function(event) {
		event.preventDefault();
		history.go(-1);
	});
	
});