function winOpen(theURL,winName,features) 
{ 
var winName  = 'BildZoom' 
winName = window.open(theURL,winName,features);
if(winName == null || winName.closed){window.open(theURL,winName,features);}  
else{winName.location.href = theURL;}  
if (!winName.closed) 
winName.focus();
}