if (document.images) {
	image1on = new Image();
	image1on.src = "image/nav/nav-on-1.gif";
	image2on = new Image();
	image2on.src = "image/nav/nav-on-2.gif";
	image3on = new Image();
	image3on.src = "image/nav/nav-on-3.gif";
	image4on = new Image();
	image4on.src = "image/nav/nav-on-4.gif";
	image5on = new Image();
	image5on.src = "image/nav/nav-on-5.gif";
	image6on = new Image();
	image6on.src = "image/nav/nav-on-6.gif";
	image7on = new Image();
	image7on.src = "image/nav/nav-on-7.gif";
	image8on = new Image();
	image8on.src = "image/nav/nav-on-8.gif";
	image9on = new Image();
	image9on.src = "image/nav/nav-on-9.gif";
	image10on = new Image();
	image10on.src = "image/nav/nav-on-10.gif";
	image11on = new Image();
	image11on.src = "image/nav/nav-on-11.gif";
	image12on = new Image();
	image12on.src = "image/nav/nav-on-12.gif";
	image13on = new Image();
	image13on.src = "image/nav/nav-on-13.gif";
	image14on = new Image();
	image14on.src = "image/nav/nav-on-14.gif";
	image15on = new Image();
	image15on.src = "image/nav/nav-on-15.gif";
	image16on = new Image();
	image16on.src = "image/nav/nav-on-16.gif";
	image17on = new Image();
	image17on.src = "image/nav/nav-on-17.gif";
	image18on = new Image();
	image18on.src = "image/nav/nav-on-18.gif";

	image1off = new Image();
	image1off.src = "image/nav/nav-off-1.gif";
	image2off = new Image();
	image2off.src = "image/nav/nav-off-2.gif";
	image3off = new Image();
	image3off.src = "image/nav/nav-off-3.gif";
	image4off = new Image();
	image4off.src = "image/nav/nav-off-4.gif";
	image5off = new Image();
	image5off.src = "image/nav/nav-off-5.gif";
	image6off = new Image();
	image6off.src = "image/nav/nav-off-6.gif";
	image7off = new Image();
	image7off.src = "image/nav/nav-off-7.gif";
	image8off = new Image();
	image8off.src = "image/nav/nav-off-8.gif";
	image9off = new Image();
	image9off.src = "image/nav/nav-off-9.gif";
	image10off = new Image();
	image10off.src = "image/nav/nav-off-10.gif";
	image11off = new Image();
	image11off.src = "image/nav/nav-off-11.gif";
	image12off = new Image();
	image12off.src = "image/nav/nav-off-12.gif";
	image13off = new Image();
	image13off.src = "image/nav/nav-off-13.gif";
	image14off = new Image();
	image14off.src = "image/nav/nav-off-14.gif";
	image15off = new Image();
	image15off.src = "image/nav/nav-off-15.gif";
	image16off = new Image();
	image16off.src = "image/nav/nav-off-16.gif";
	image17off = new Image();
	image17off.src = "image/nav/nav-off-17.gif";
	image18off = new Image();
	image18off.src = "image/nav/nav-off-18.gif";

}

function turnOn(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName + "on.src");
	}
}

function turnOff(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName + "off.src");
	}
}