function initRollOverImages() {
	var image_cache_ov = new Object();
	$(".rollover").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);
		image_cache_ov[this.src] = new Image();
		image_cache_ov[this.src].src = imgsrc_ov;
		$(this).hover(
			function() { this.src = imgsrc_ov; },
			function() { this.src = imgsrc; }
		);
	});

	var image_cache_on = new Object();
	$(".rollon").not("[src*='_on.']").each(function(i) {
		var imgsrc = this.src;
		var dot = this.src.lastIndexOf('.');
		var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
		image_cache_on[this.src] = new Image();
		image_cache_on[this.src].src = imgsrc_on;
		$(this).mousedown(function() {
			this.src = imgsrc_on;
		});
		$(this).mouseup(function() {
			this.src = imgsrc;
		});
	});

}
$(document).ready(initRollOverImages);