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) {
		homepage15a = newImage("images/homepage15a.jpg");
		homepage16a = newImage("images/homeoage16a.jpg");
		homepage17a = newImage("images/homepage17a.jpg");
		homepage18a = newImage("images/homepage18a.jpg");
		homepage19a = newImage("images/homepage19a.jpg");
		preloadFlag = true;
	}
}