$(document).ready(function() {
		$("#top-menu li ul").addClass("hidden");
		$("#top-menu > li > a")
			.bind("focus mouseover", showLayer);

		$("#util-menu li a")
			.bind("focus mouseover", imageOver)
			.bind("blur mouseout", imageOut);

		$("#skip-nav li a")
			.bind("focus mouseover", imageOver)
			.bind("blur mouseout", imageOut);

		$("#top-menu > li > a")
			.bind("focus mouseover", imageOver)
			.bind("blur mouseout", imageOut);

		$("#side-menu li a")
			.bind("focus mouseover", imageOver)
			.bind("blur mouseout", imageOut);
	});

	function showLayer() {
		$("#top-menu li ul").addClass("hidden");
		$(this).parent().find("ul:first").removeClass("hidden");
	}


	function imageOver() {
        var imgObj = this.childNodes[0];
        if (imgObj.src.indexOf("_on") < 0) {
        	var ext = imgObj.src.substring(imgObj.src.length - 4);
        	imgObj.src = imgObj.src.substring(0, imgObj.src.length - 4) + "_on" + ext;
        }
	}

	function imageOut() {
        var imgObj = this.childNodes[0];
        if (imgObj.src.indexOf("_on") > 0) {
        	var ext = imgObj.src.substring(imgObj.src.length - 4);
			imgObj.src = imgObj.src.substring(0, imgObj.src.length - 7) + ext;
        }
	}