/* rollover */
function initRollOverImages() {
	var image_cache = new Object();
	$("img.roll").each(function(i) {
		var imgsrc = this.src;
		var dot = this.src.lastIndexOf('.');
		var imgsrc_r = this.src.substr(0, dot) + '_r' + this.src.substr(dot, 4);
		image_cache[this.src] = new Image();
		image_cache[this.src].src = imgsrc_r;
		$(this).hover(
			function() { this.src = imgsrc_r; },
			function() { this.src = imgsrc; });
	});
}

$(document).ready(initRollOverImages);