<!-- 
if (document.images) {
// nav on
img1on = new Image();
img1on.src="images/nav/btn1on.gif";
img2on = new Image();
img2on.src="images/nav/btn2on.gif";
img3on = new Image();
img3on.src="images/nav/btn3on.gif";
img4on = new Image();
img4on.src="images/nav/btn4on.gif";
img5on = new Image();
img5on.src="images/nav/btn5on.gif";

// nav off
img1off = new Image();
img1off.src="images/nav/btn1.gif";
img2off = new Image();
img2off.src="images/nav/btn2.gif";
img3off = new Image();
img3off.src="images/nav/btn3.gif";
img4off = new Image();
img4off.src="images/nav/btn4.gif";
img5off = new Image();
img5off.src="images/nav/btn5.gif";
}

function imgOn(imgName) {
if (document.images) { document[imgName].src = eval(imgName + "on.src"); }
}

function imgOff(imgName) {
if (document.images) { document[imgName].src = eval(imgName + "off.src"); }
}
// -->