if (document.images) {
	homeOff = new Image
	homeOn = new Image
	portOff = new Image
	portOn = new Image
	techOff = new Image
	techOn = new Image
	abouOff = new Image
	abouOn = new Image
	contOff = new Image
	contOn = new Image

	homeOff.src = "images/home-off.gif"
	homeOn.src = "images/home-on.gif"
	portOff.src = "images/portfolio-off.gif"
	portOn.src = "images/portfolio-on.gif"
	techOff.src = "images/technical-off.gif"
	techOn.src = "images/technical-on.gif"
	abouOff.src = "images/aboutus-off.gif"
	abouOn.src = "images/aboutus-on.gif"
	contOff.src = "images/contact-off.gif"
	contOn.src = "images/contact-on.gif"
}

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