$(document).ready(function(){	
	$(".rollover img, input.rollover").hover(
		function(){
		   var newSrc = $(this).attr("src").replace(".off",".over");
		   $(this).attr({src:newSrc});
		   $(this).css({cursor:"pointer"});
		   },
		function(){
			var newSrc = $(this).attr("src").replace(".over",".off");
		   $(this).attr({src:newSrc});
		});
	
	$('.rollup img, input.rollup').mouseover(function(){
		var height = (0 - ($(this).attr('height')/2)) + "px";
		if (height == "NaNpx")
		{
		   var height = (0 - parseInt($(this).css('height').replace('px','')) / 2) + "px";
		}
		$(this).css({'margin-top':height});
	});
	
	$('.rollup img, input.rollup').mouseout(function(){
		$(this).css({'margin-top':'0px'});
	});
});