quadratino intorno al radio button

[J.Lankart]

eccomi!!
allora, vi posto lo screen e il codice:


<%@ Page Language="VB" MasterPageFile="~/Modello.master" AutoEventWireup="false" CodeFile="ricercaAvanzata.aspx.vb" Inherits="ricercaAvanzata" title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="cph1" Runat="Server">
<asp:Panel ID="PnlTestoCentrale" runat="server" Visible="true">
<table cellpadding="0" cellspacing="0">
<tr>
<td colspan="2" class="TitoloPagina">Ricerca avanzata</td>
</tr>
<tr>
<td style="width:100px"></td>
<td></td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td class="Normale" style="text-align:right">Elemento di ricerca:</td>
<td class="Normale"><asp:TextBox ID="txtRicerca" runat="server" BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" Font-Bold="True" Font-Names="Verdana" Font-Size="9pt" Height="13px" Width="90px"></asp:TextBox></td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td class="Evidenziato" style="text-align:right">Cerca in:</td>
<td class="Normale"><asp:RadioButton ID="RadioButton1" AutoPostBack="true" runat="server" GroupName="TipoRicerca" />Documenti </td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td style="height: 58px"></td>
<td class="Normale" style="height: 58px"><asp:RadioButton ID="RadioButton2" AutoPostBack="true" runat="server" Checked="True" GroupName="TipoRicerca"/>Contenuti</td>
</tr>
<tr>
<td></td>
<td class="Normale"><asp:CheckBox ID="CheckBox1" runat="server" Text=" Pagine" /></td>
</tr>
<tr>
<td></td>
<td class="Normale"><asp:CheckBox ID="CheckBox2" runat="server" Text=" Bacheca"/></td>
</tr>
<tr>
<td></td>
<td class="Normale"><asp:CheckBox ID="CheckBox3" runat="server" Text=" News"/></td>
</tr>
<tr>
<td></td>
<td class="Normale"><asp:CheckBox ID="CheckBox4" runat="server" Text=" Glossario"/></td>
</tr>
<tr>
<td></td>
<td class="Normale"><asp:CheckBox ID="CheckBox5" runat="server" Text=" FAQ"/></td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td class="Normale"></td>
<td class="Normale"><asp:Button ID="Button1" runat="server" Text="Cerca >>" /></td>
</tr>
</table>
</asp:Panel>
</asp:Content>