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

function changeImages(objName, imgSrc) {
	if (document.images && (preloadFlag == true)) {
	    document[objName].src = imgSrc;
//		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) {
		button_home_over = newImage("images/header/button_home_over.gif");
		button_biography_over = newImage("images/header/button_biography_over.gif");
		gallery_asp_over = newImage("images/header/gallery.asp_over.gif");
		button_reviews_over = newImage("images/header/button_reviews_over.gif");
		button_contact_over = newImage("images/header/button_contact_over.gif");
		preloadFlag = true;
	}
}
preloadImages();