function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nav1 = newImage("images/navOver_01.gif");
		nav3= newImage("images/navOver_03.gif");
		nav4 = newImage("images/navOver_04.gif");
		nav5 = newImage("images/navOver_05.gif");
		nav6 = newImage("images/navOver_06.gif");
		nav7 = newImage("images/navOver_07.gif");
		nav8 = newImage("images/navOver_08.gif");
		nav9 = newImage("images/navOver_09.gif");		
		preloadFlag = true;
	}
}