$(function(){
	$('.rollover').each(
		function(){
			var jImg = $(this);
			var outSrc = jImg.attr('src');
			var sExt = outSrc.substring(outSrc.lastIndexOf('.'), outSrc.length);

			var overSrc = outSrc.replace(sExt, '-h' + sExt);
			var img = new Image();
			img.src = overSrc;

			jImg.hover(
				function(){
					jImg.attr('src', overSrc);
				},
				function(){
					jImg.attr('src', outSrc);
				}
			);
		}
	)
});