How to expire a pop window in asp.net

Question

I have two buttons in my page login and register,

If i click login am showing a login popup(user id and password) ,

if this pop up stable for 5 minutes , i want redirect that to expired.aspx page, how to do this

 

this is my code

 

<form id="form1" runat="server">

<input type="hidden" name="ctl00$TxbWater1_ClientState" id="TxbWater1_ClientState" />

<div onload="document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'" onkeydown="checkKeycode2">

<div id="light" class="white_content">

<table cellpadding="0" cellspacing="0" border="0" style="background-color: #FFFFFF; font-family: Verdana, Geneva, Tahoma, sans-serif;"

width="100%">

<tr>

<td height="16px">

<a href="javascript:void(0)" id="pop_up_pretrazivanje:closeButton" onclick="document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">

<img src="Images/delete.png" style="border-style: none; border-color: inherit; border-width: 0px; height: 20px; width: 20px;"

align="right" alt="Close" /></a>

</td>

</tr>

<tr>

<td style="padding-left: 16px; padding-right: 16px; padding-bottom: 16px">

<table align="center" border="0" cellpadding="0" cellspacing="0" style="background-color: #fff"

width="100%">

<tr>

<td align="center" colspan="2" class="headertext">

<h1 class="LoginHead" align="center">LOGIN</h1>

</td>

</tr>

<tr>

<td>&nbsp;

</td>

</tr>

<tr>

<td align="center">

<table>

<tr>

<td align="right" class="bot_text">Username:

</td>

<td>

<%--<input type="text" runat="server" id="txtSearchTerm" placeholder="Username" value="txtName" />--%>

<asp:TextBox ID="txtName" runat="server" placeholder="Username"></asp:TextBox>

</td>

</tr>

<tr>

<td height="10px"></td>

<td>

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName"

ErrorMessage="User ID Required" ValidationGroup="a" CssClass="content3" ForeColor="#FF3300"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td align="right" class="bot_text">Password:

</td>

<td>

<asp:TextBox ID="txtPassword" runat="server" TextMode="Password" placeholder="Password"></asp:TextBox>

</td>

</tr>

<tr>

<td align="right"></td>

</tr>

<tr>

<td height="10px"></td>

<td>

<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtPassword"

ErrorMessage="Password Required" ValidationGroup="a" CssClass="content3" ForeColor="#FF3300"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td></td>

<td align="center">

<asp:Button ID="_btnLogin" runat="server" Text="Login" CssClass="Button1" ValidationGroup="a"

Height="40px" Width="100px" />

</td>

</tr>

</table>

<table>

<tr>

<td>

<a href="ForgotPassword.aspx" class="style4" style="font-family: Verdana">Forgot password?</a>&nbsp

| &nbsp<a href="Registration.aspx" class="style4" style="font-family: verdana">Register</a>

</td>

</tr>

</table>

</td>

</tr>

<tr>

<td height="10px"></td>

</tr>

</table>

</td>

</tr>

</table>

</div>

<div id="fade" class="black_overlay">

</div>

</div>

<asp:Panel ID="Panel1" runat="server">

<pre style="margin-bottom: 10px"><a href="javascript:void(0)" onclick="document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'"

style="font-size: small; color: #0000FF; font-family: verdana;">Login</a>|<a class="anchor"

href="Registration.aspx" style="font-family: verdana; font-size: small; color: #0000FF;">Register</a></pre>

</asp:Panel>

</form>

 

 

Javascript

 

<script type="text/javascript">

window.onkeyup = function (event) {

if (event.keyCode == 27) {

window.close();

}

}

</script>

<script type="text/javascript">

document.onkeydown = checkKeycode2

function checkKeycode2(e) {

var keycode;

if (window.event) keycode = window.event.keyCode;

else if (e) keycode = e.which;

if (keycode == 27) {

var obj;

obj = document.getElementById('pop_up_pretrazivanje:closeButton');

if (obj != null) {

document.getElementById('pop_up_pretrazivanje:closeButton').click();

}

}

}

</script>