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) {
		navhome1_over = newImage("img/nav/home_nav1.gif");
		navhome2_over = newImage("img/nav/home_nav2.gif");
		navhome3_over = newImage("img/nav/home_nav3.gif");
		navhome4_over = newImage("img/nav/home_nav4.gif");
		nav1home_over = newImage("img/nav/home_1o.png");
		nav2home_over = newImage("img/nav/home_2o.png");
		nav3home_over = newImage("img/nav/home_3o.png");
		nav4home_over = newImage("img/nav/home_4o.png");
		preloadFlag = true;
	}
}

function popup(data,width,height) {
    var winwidth = (screen.width - width) / 2;
    var winheight = (screen.height - height) / 2;
    Neufenster2=window.open(data,"Zweitfenster2","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,top="+winheight+",left="+winwidth+",height="+height+",width="+width); 
 		setTimeout('Neufenster2.focus();',250);
}