CLEARING RADIO BUTTONS

How to clear radio buttons and clear a form

Example code for Clearing radio buttons:
<script language="javascript">
    <!--
       function clearAll(){
         
         var mainform=document.form1;
         mainform.first_name.value='';
         mainform.last_name.value='';
         mainform.address.value='';
         mainform.city.value='';
         mainform.state.value='';
         mainform.zip.value='';
         mainform.email.value='';
         
          for (var i = 0; i < mainform.optin.length; i++) {
             mainform.optin[i].checked = false;
          }

       }
    //-->
    </script>


<A href="javascript:clearAll()">clear form</A>