<input type="radio" name="id[<? echo $i;?>]" value="<? echo $id;?>"  
onclick="add('<? echo $preis; ?>'),self.close()" /> 

<input type="hidden" name="produkt_name" value="<? echo $produkt_name; ?>" /> 

<script type="text/javascript"> 
document.Testform.Browser.value = navigator.userAgent; 
document.write(document.Testform.Browser.value); 
</script> 

<input type="hidden" name="produkt_name" value="<? echo $produkt_name; ?>" /> 

<script language="javascript"> 
function add(preis){ 
   opener.Form5.zahl8.value += preis; 
} 
</script> 
 
<input type="radio" name="id[<? echo $i;?>]"  
value="<? echo $id;?>" onclick="add('<? echo $preis; ?>'),self.close()" /> 

<script language="javascript">  
function add(){  
   opener.Form5.zahl8.value += <? echo $preis; ?>;  
   opener.Form5.hiddenfeld.value += <? echo $hiddenfeld; ?>;  
}  
</script>  
  
<input type="radio" onclick="add();self.close()" />