var details_offen=false; 

function details() 
{ 
	
  det=open('','det','toolbar=no,width=500,height=600,scrollbars=yes,location=no'); 
  det.focus(); 
  details_offen=true; 
} 


function ende() 
{ 
 if ((details_offen==true) && (!det.closed)){det.close();} 
}