if (document.images) {
	homeOff = new Image
	homeOn = new Image
	schoolOff = new Image
	schoolOn = new Image
	historyOff = new Image
	historyOn = new Image
	curriculumOff = new Image
	curriculumOn = new Image
	extraOff = new Image
	extraOn = new Image
	newsOff = new Image
	newsOn = new Image
	calendarOff = new Image
	calendarOn = new Image
	parentsOff = new Image
	parentsOn = new Image

	homeOff.src = "images/home-off.gif"
	homeOn.src = "images/home-on.gif"
	schoolOff.src = "images/school-off.gif"
	schoolOn.src = "images/school-on.gif"
	historyOff.src = "images/history-off.gif"
	historyOn.src = "images/history-on.gif"
	curriculumOff.src = "images/curriculum-off.gif"
	curriculumOn.src = "images/curriculum-on.gif"
	extraOff.src = "images/extra-off.gif"
	extraOn.src = "images/extra-on.gif"
	newsOff.src = "images/news-off.gif"
	newsOn.src = "images/news-on.gif"
	calendarOff.src = "images/calendar-off.gif"
	calendarOn.src = "images/calendar-on.gif"
	parentsOff.src = "images/parents-off.gif"
	parentsOn.src = "images/parents-on.gif"
}

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