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) {
		home_over = newImage("../img/menu/01-home_a.gif");
		production_over = newImage("../img/menu/02-production_a.gif");
		documents_over = newImage("../img/menu/03-documents_a.gif");
		attributes_over = newImage("../img/menu/04-attributes_a.gif");
		contacts_over = newImage("../img/menu/05-contacts_a.gif");
		upcont_over = newImage("../img/menu/02-contacts_a.gif");
		upadmin_over = newImage("../img/menu/03-admin_a.png");
	    preloadFlag = true;
	}
}