// RollOver Setting
function interruptRollover() {
	var image_cache = new Object();
	$("img.roll").each(function(i) {
		var imageSrc = this.src;
		var dot = this.src.lastIndexOf('.');
		var imageSrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
		image_cache[this.src] = new Image();
		image_cache[this.src].src = imageSrc_on;
		$(this).hover(
			function() { this.src = imageSrc_on; },
			function() { this.src = imageSrc; }
		);
	});
}

$(document).ready(interruptRollover);