check this is my master
<div class="wrap clearfix">
<div style="text-align: left; background-color: #396184; width: 970px;">
<table cellpadding="0" cellspacing="0">
<tr>
<td>
<asp:Menu ID="mainMenu" runat="server" Orientation="Horizontal" BorderStyle="None"
ItemWrap="True" Width="400px" CssClass="padL15">
<StaticMenuStyle HorizontalPadding="1px" />
<StaticMenuItemStyle ForeColor="White" HorizontalPadding="1px" />
<DynamicMenuStyle BackColor="#e1e1e1" />
<DynamicMenuItemStyle ForeColor="#3f6080" />
<DynamicMenuStyle Width="150px" Height="70px" HorizontalPadding="15px" />
<Items>
<asp:MenuItem Text="ADMIN" Value="Admin">
<asp:MenuItem Text="New User" Value="USER" NavigateUrl="~/RegistrationForm.Aspx"
SeparatorImageUrl="~/images/seprator.jpg"></asp:MenuItem>
</Items>
</asp:Menu>
</td>
</tr>
</table>
</div>
</div>
<div>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
</asp:contentplaceholder>
</div>
and one aspx.page which under the that master
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
<table>
//your code..........
</table>
</asp:contentplaceholder>