function neues_fenster(URL,name,breite,hoehe)
 {
  outfit = "screenX=0,screenY=0,width="+breite+",height="+(hoehe)+",left="+(mx-(3/4*breite))+",top="+(my-(hoehe/2))+",resizable=yes,scrollbars=no";
  fenster1 = window.open(URL,name,outfit);
  fenster1.focus(); 
}

 var mx=0;
 var my=0;

 function Position(Ereignis)
 {
 mx=Ereignis.screenX;
 my=Ereignis.screenY;
 }