function owin(datei,name,breite,hoehe) {
//Positionierung der Bilder in der Bildschirmmitte:  
  var breite,hoehe;
  var sw = screen.width;
  var sh = screen.height;
  if(sw>breite && (sh-100)>hoehe) {
  var left = Math.round((sw-breite)*0.5);
  var top = Math.round((sh-hoehe)*0.5)-50;
  }
	 else { 
	 var left = 20;
	 var top = 20;
	 }
  
  var width, height;
  
  width = breite+2;
  height = hoehe + 30;  
  // if (width>sw-50) width = sw-50;
  // if (height>sh-100) height = sh-100;
  //var w = window.open(datei,name,'width='+width+',height='+height+',scrollbars=no,directories=no,resizable=no,toolbar=no,location=no,status=no,menubar=no,left='+left+',top='+top);
  var w = window.open(datei,name,'width='+width+',height='+height+',scrollbars=no,resizable=no,status=no,left='+left+',top='+top);

  //w.focus();
  //return(w);
}