How can I use a Timer Control to refresh a page automatically at a specified interval?

How can I use a Timer Control to refresh a page automatically at a specified interval?

<asp:DropDownList id="DropDownList1" runat="server" onChange="SetClientRefresh(this);">
     <asp:ListItem Value="1000">1 second</asp:ListItem>
     <asp:ListItem Value="2000">2 seconds</asp:ListItem>
     <asp:ListItem Value="3000">3 seconds</asp:ListItem>
</asp:DropDownList>

<script language='javascript'>
var cTimeOut = null;
function SetClientRefresh(sel)
{
     var newRefresh = sel.options[sel.selectedIndex].value;
     if (cTimeOut != null)
     {
          window.clearTimeout(cTimeOut);
     }
     cTimeOut = window.setTimeout("ReLoadPage()", newRefresh);
}

function ReLoadPage()
{
     window.location.reload();
}
</script>