var NN4 = (document.layers) ? true : false;
var ie4 = (document.all) ? true : false;

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

function changeImages(layername, source, img) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			if (NN4) {
			document.layers[layername].document.images[img].src = source;}
			else{
			document[img].src = source;}
		}
	}
}
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		imageone = newImage("/i/rollovers/aj_about_h_advertise_on.gif");
		imagetwo = newImage("/i/rollovers/aj_about_h_advertise_off.gif");
		preloadFlag = true;
	}
}