function PopupMitte(theURL, breite, hoehe)
{
var posX=(screen.availWidth-breite)/2;
var posY=(screen.availHeight-hoehe)/2;
window.open(theURL,"","width=" + breite + ",height=" + hoehe + ",scrollbars=0,resizable=0,screenX=" + posX + ",screenY=" + posY + ",left=" + posX + ",top=" + posY + "");
this.name = "ziel"
}