<form action="beispiel_auswertungs.html" method="get">

     <input type="radio" name="Box" value="30" onClick="zurueck(this)">
     <input type="radio" name="Box" value="20" onClick="zurueck(this)" checked>
     <input type="radio" name="Box" value="40" onClick="zurueck(this)">
     <input type="radio" name="Box" value="50" onClick="zurueck(this)">
     <input type="radio" name="Box1" value="10" onClick="zurueck(this)">
     <input type="radio" name="Box1" value="30" onClick="zurueck(this)" checked>

</form>

<script type="text/javascript">
<!-- Methode click()

function zurueck(feld)
{
     if (feld.defaultChecked!=true)
     {
     for (i=0;i<document.forms[0][feld.name].length;i++)
        if (document.forms[0][feld.name][i].defaultChecked==true)
           { document.forms[0][feld.name][i].click();return; }
     }
     if (document.getElementById && !document.all)
         {           //Workaround für Netscape Navigator 6
          merker=feld;
          setTimeout("merker.checked=merker.defaultChecked",0)
         }
     else
      feld.checked=feld.defaultChecked;
}

//-->
</script>