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) {
		General_over = newImage("images/banner-images/General-over.gif");
		Aerospace_General_over = newImage("images/banner-images/Aerospace-General_over.gif");
		Space_General_over = newImage("images/banner-images/Space-General_over.gif");
		Space_over = newImage("images/banner-images/Space-over.gif");
		Energy_Space_over = newImage("images/banner-images/Energy-Space_over.gif");
		Energy_over = newImage("images/banner-images/Energy-over.gif");
		aero_banner_10_Energy_over = newImage("images/banner-images/aero-banner_10-Energy_over.gif");
		preloadFlag = true;
	}
}