if (document.images) {

	aboutusOff = new Image
	aboutusOn = new Image
	productsOff = new Image
	productsOn = new Image
	contactusOff = new Image
	contactusOn = new Image

	aboutusOff.src = "images/navigation/aboutus_off.gif"
	aboutusOn.src = "images/navigation/aboutus_over.gif"
	productsOff.src = "images/navigation/products_off.gif"
	productsOn.src = "images/navigation/products_over.gif"
	contactusOff.src = "images/navigation/contactus_off.gif"
	contactusOn.src = "images/navigation/contactus_over.gif"
}

function chgImg(imgField,newImg) {
	if (document.images) {
		document[imgField].src= eval(newImg + ".src")
	}
}