$(document).ready(
	function(){

		// add rollover to all images with class rollover
		$('img.rollover').hover(
			function () {
				// mouse over
				var new_src = $(this).attr('src');
				new_src = new_src.substring(0, new_src.lastIndexOf('.')) + '_over' + new_src.substring(new_src.lastIndexOf('.'));
				//alert(new_src);
				$(this).attr('src', new_src);
			},
			
			function () {
				// mouse out
				var new_src = $(this).attr('src');
				new_src = new_src.replace('_over', '');
				$(this).attr('src', new_src);
			}
		);


		$('img.rollover').each(
			function () {
				var img = new Image();
				var new_src = $(this).attr('src');
				new_src = new_src.substring(0, new_src.lastIndexOf('.')) + '_over' + new_src.substring(new_src.lastIndexOf('.'));
				img.src = new_src;
			}
		);
			



	}
);