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) {
		nav01o = newImage("images/nav01o.gif");
		nav02o = newImage("images/nav02o.gif");
		nav03o = newImage("images/nav03o.gif");
		nav04o = newImage("images/nav04o.gif");
		nav05o = newImage("images/nav05o.gif");
		nav06o = newImage("images/nav06o.gif");
		nav07o = newImage("images/nav07o.gif");
		preloadFlag = true;
	}
}