ASP:Button Posting and Panels

See more:

ASP.NET

I'm struggling with an ASP.NET site I'm making. I have a "master" page which contains a DIV header with a search box/button combo. The form tag rolls over the content section too.

<form id="form1" runat="server">
<div class="content" id="Div1"  runat="server">
  <asp:Panel DefaultButton="searchbutton">
    <asp:TextBox ID="searchquery" runat="server" class="searchbox" />
    <asp:Button ID="performsearch" runat="server" class="searchbutton" PostBackUrl="Search.aspx" />
  </asp:Panel>
</div>

Inside my "login" page, I have another button for logging in

<asp:Panel DefaultButton="loginbtn">
<table style="width: 100%; padding: 4px 4px 4px 4px; margin: 4px 4px 4px 4px;">
  <tr>
    <td style="text-align: center;" colspan="2">Returning User?</td>
  </tr>
  <tr>
    <td style="width: 50%; text-align: right;">Email Address</td>
    <td style="width: 50%; text-align: left;"><asp:TextBox runat="server" ID="usrname" name="usrname"></asp:TextBox></td>
  </tr>
  <tr>
    <td style="width: 50%; text-align: right;">Password</td>
    <td style="width: 50%; text-align: left;"><asp:TextBox runat="server" TextMode="Password" ID="passwrd" name="passwrd"></asp:TextBox></td>
  </tr>
  <tr>
    <td colspan="2" style="text-align: center;"><asp:Button runat="server" ID="loginbtn" name="loginbtn" Text="Log In" /></td>
  </tr>
</table>
</asp:Panel>

Now I read that the only way to handle users pressing the enter key was to seperate the sections in Panels, however, even in my passwrd box, if I press enter, I get directed to Search.aspx instead of posting back to my Login page.

Have I done something wrong? or is there a different way of doing it?

Cheers