function popup2(w,h,ziel) 
	{
		h = h - 20; var x=0, y=0, parameter="";
  		if (w < screen.availWidth || h < screen.availHeight) 
		{
    	 x = (screen.availWidth - w - 12) / 2;
    	 y = (screen.availHeight - h - 104) / 2;
    	  if (window.opera) y = 0; // Opera positioniert unter den Symbolleisten
    	  if (x<0 || y<0) { x=0; y=0; }
    	else parameter = "width=" + w + ",height=" + h + ",";
  		}
  
  		parameter += "left=" + x + ",top=" + y;
  		parameter += ",menubar=no,location=no,toolbar=no,status=no";
  		parameter += ",resizable=no,scrollbars=no";
  
  		var Fenster = window.open(ziel,"popup2",parameter);
  
		if (Fenster) Fenster.focus();
		 return !Fenster;
	}