if (document.images) {

	//"On" images
	img1on = new Image();
	img1on.src = "images/navcom_on.gif";
	img2on = new Image();
	img2on.src = "images/navmod_on.gif";
	img3on = new Image();
	img3on.src = "images/navabo_on.gif";
	img4on = new Image();
	img4on.src = "images/navnew_on.gif";
	img5on = new Image();
	img5on.src = "images/navhom_on.gif";

	//"Off" images
	img1off = new Image();
	img1off.src = "images/navcom_off.gif";
	img2off = new Image();
	img2off.src = "images/navmod_off.gif";
	img3off = new Image();
	img3off.src = "images/navabo_off.gif";
	img4off = new Image();
	img4off.src = "images/navnew_off.gif";
	img5off = new Image();
	img5off.src = "images/navhom_off.gif";
}

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

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