function navifenster() {

var winl = (screen.width - 550) / 2;
var winl2 = (screen.width - 550) / 2 + 250;
var wint = (screen.height - 550) / 2;
var fullw = (screen.width);
var fullh = (screen.height);
var unten = (screen.height - 240);
self.moveTo(0,0);
self.resizeTo(fullw,fullh);

winprops2 = 'height=550,width=100,top='+wint+',left='+winl+',location=no,scrollbars=no,menubars=no,toolbars=no,resizable=no,status=no'
var GalerieNavi = window.open('navi.html','GalerieNavi',winprops2)
}