Use of Javascript to allow RadioButton grouping to work in Repeater

1.) JavaScript
<script language="javascript" type="text/javascript">
   function RadioSelectionChanged(groupName, current) {
     var group = document.getElementsByName(groupName);

     for (i = 0; i < group.length; i++) {
        //.NET uses a span tag to define the control "name", so the first control in the span control will be the radiobutton        if(group[i].childNodes.length > 0 && group[i].childNodes[0].type == 'radio')
         group[i].childNodes[0].checked = false;
    }     current.checked = true;
  }</script>

2.) Control
<asp:Repeater ID="Rptr" runat="server">
  <ItemTemplate>
    <asp:RadioButton ID="Rb" runat="server" onclick="RadioSelectionChanged('GroupName', this);" name="GroupName"  />
   </ItemTemplate>
</asp:Repeater>