<script language ="javascript>
<!--
function whatever()
{  
     var TextBoxName = document.FormName.TextBoxName.disabled = true;
     var radioButtonNameYes = false;
     var radioButtonNameNo = false;
     if(document.nameOftheForm.radioButtonName(yes).checked)
     {
        radioButtonName = true;     
        document.FormName.textBoxName.disabled=false;
        document.FormName.textBoxname.value = " ";
     } else 
            {
               //do the "No" radio button
            }
 
}
//-->
 
</script>