function resize(w,h)
{
var posleft=screen.availWidth/2
var postop=screen.availHeight/2

// ------- kleiner Bildschirm ?
if(screen.availHeight<=h){
var h=screen.availHeight
}
if(screen.availWidth<=w){
var w=screen.availWidth
}
//-----------------------------
var centerv=postop-(h/2)
var centerh=posleft-(w/2)

var z=self.resizeTo(w,h)
var u=self.moveTo(centerh,centerv)
self.focus();
}