if (document.images) {
	homeOff = new Image
	homeOn = new Image
	philOff = new Image
	philOn = new Image
	servOff = new Image
	servOn = new Image
	enviOff = new Image
	enviOn = new Image
	careOff = new Image
	careOn = new Image
	contOff = new Image
	contOn = new Image

	homeOff.src = "images/home-off.png"
	homeOn.src = "images/home-on.png"
	philOff.src = "images/philosophy-off.png"
	philOn.src = "images/philosophy-on.png"
	servOff.src = "images/services-off.png"
	servOn.src = "images/services-on.png"
	enviOff.src = "images/environmental-off.png"
	enviOn.src = "images/environmental-on.png"
	careOff.src = "images/careers-off.png"
	careOn.src = "images/careers-on.png"
	contOff.src = "images/contact-off.png"
	contOn.src = "images/contact-on.png"
}

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