function RollImages() {
	var image_cache = new Object();
	$(".rollover, .rollclick").not("[src*='_ov.']").each(function(i) {
		var imgsrc = this.src;
		var dot = this.src.lastIndexOf('.');
		var imgsrc_ov = this.src.substr(0, dot) + '_ov' + this.src.substr(dot, 4);
		var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
		image_cache[this.src] = new Image();
		image_cache[this.src].src = imgsrc_ov;
		image_cache[this.src].src = imgsrc_on;
		$(".rollover, .rollclick").hover(
			function() {
				this.src = imgsrc_ov;
			},
			function() {
				this.src = imgsrc;
			}
		);

		$(".rollclick").mousedown(function() {
			this.src = imgsrc_on;
		});
		$(".rollclick").mouseup(function() {
			this.src = imgsrc;
		});
	});
}
$(document).ready(RollImages);