if (document.images) {
		image1on = new Image(); image1on.src = "images/button_1o.jpg";
		image1off = new Image(); image1off.src = "images/button_1.jpg";
		image2on = new Image(); image2on.src = "images/button_2o.jpg";
		image2off = new Image(); image2off.src = "images/button_2.jpg";
		image3on = new Image(); image3on.src = "images/button_3o.jpg";
		image3off = new Image(); image3off.src = "images/button_3.jpg";
		image4on = new Image(); image4on.src = "images/button_4o.jpg";
		image4off = new Image(); image4off.src = "images/button_4.jpg";
		image5on = new Image(); image5on.src = "images/button_5o.jpg";
		image5off = new Image(); image5off.src = "images/button_5.jpg";
		image6on = new Image(); image6on.src = "images/button_6o.jpg";
		image6off = new Image(); image6off.src = "images/button_6.jpg";
		image7on = new Image(); image7on.src = "images/button_7o.jpg";
		image7off = new Image(); image7off.src = "images/button_7.jpg";
		image8on = new Image(); image8on.src = "images/button_8o.jpg";
		image8off = new Image(); image8off.src = "images/button_8.jpg";
		image9on = new Image(); image9on.src = "images/button_9o.jpg";
		image9off = new Image(); image9off.src = "images/button_9.jpg";
		image10on = new Image(); image10on.src = "images/button_10o.jpg";
		image10off = new Image(); image10off.src = "images/button_10.jpg";
		image11on = new Image(); image11on.src = "images/button_11o.jpg";
		image11off = new Image(); image11off.src = "images/button_11.jpg";
		image12on = new Image(); image12on.src = "images/button_12o.jpg";
		image12off = new Image(); image12off.src = "images/button_12.jpg";
		image13on = new Image(); image13on.src = "images/button_13o.jpg";
		image13off = new Image(); image13off.src = "images/button_13.jpg";
	}

	function imageOff(imgName) {
		if (document.images) {document.images[imgName].src = eval(imgName + "off.src");}
	}
	function imageOn(imgName) {
		if (document.images) {document.images[imgName].src = eval(imgName + "on.src");}
	}