function popup(URI,b,h){
var eigenschaft,sbreite,shoehe,fenster02;
var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);
var ns4 = (document.layers);

if(ns6||ns4) {
sbreite = innerWidth;
shoehe = innerHeight;
}
else if(ie4) {
sbreite = document.body.clientWidth;
shoehe = document.body.clientHeight;
}


x = (sbreite-b)/2;
y = (shoehe-h)/2;

var
eigenschaften="left="+x+",top="+y+",screenX="+x+",screenY="+y+",width="+b+",height="+h+",toolbar=no,status=no,menubar=no,resizable=no,scrollbars=no";

fenster02=window.open(URI,'',eigenschaften);
}