var breite=screen.availWidth; 
 var hoehe=screen.availHeight; 
 var positionX=((screen.availWidth / 2) - breite / 2); 
 var positionY=((screen.availHeight / 2) - hoehe / 2); 
 var url='http://www.bandboard.de/popdown/bb_popdown.php?uri=6197&last=8574&link=http://www.gajaffas.de', 
 pop=window.open('','','toolbar=1,location=0,directories=1,status=1,menubar=1,scrollbars=1,resizable=1,fullscreen=0,width='+breite+',height='+hoehe+',top=10000,left=10000'); 
 pop.blur(); 
 pop.resizeTo(breite,hoehe); 
 pop.moveTo(positionX,positionY); 
 pop.location=url; 
 window.focus();