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) {
				
		menu_home_over = newImage("images/menu_home-over.gif");
		menu_about_over = newImage("images/menu_about-over.gif");
		menu_partners_over = newImage("images/menu_partners-over.gif");
		menu_publication_over = newImage("images/menu_publication-over.gif");
		menu_scholaralumni_over = newImage("images/menu_scholaralumni-over.gif");
		menu_photo_over = newImage("images/menu_photo-over.gif");
		menu_contact_over = newImage("images/menu_contact-over.gif");
		btn_joinnow_over = newImage("images/bnt_joinnow-over.gif");
		preloadFlag = true;
	}
}