if (document.images)
{	icon1 = new Image();
	icon1.src = "/image/icon1.png";
	icon1h = new Image();
	icon1h.src = "/image/icon1h.png";
	
	icon2 = new Image();
	icon2.src = "/image/icon2.png";
	icon2h = new Image();
	icon2h.src = "/image/icon2h.png";
	
	icon3 = new Image();
	icon3.src = "/image/icon3.png";
	icon3h = new Image();
	icon3h.src = "/image/icon3h.png";
	
	icon4 = new Image();
	icon4.src = "/image/icon4.png";
	icon4h = new Image();
	icon4h.src = "/image/icon4h.png";
}

// Function to 'activate' images.
function imgOn(imgName) {
	if (document.images) document[imgName].src = eval(imgName + "h.src");
}

// Function to 'deactivate' images.
function imgOff(imgName) {
	if (document.images) document[imgName].src = eval(imgName + ".src");
}