function setVariables() {
hoch=screen.height/2;
breit=screen.width/2;

}


var of = 0;

function opwin () {
//Ist Fenster offen?
if (of == 1){
   webten.close();
   of=0;
}
//Öffne Fenster mit Inhalt
 webten = window.open("home.html","Wilkommen","toolbar=0,location=0,directories=0,status=0,menuebar=0,scrollbars=0,resizable=0,width=755,height=380");
 webten.moveTo(breit-377,hoch-190);
 of=1;
}