Want to hide modalpopup control at cancel button

The html source is as below:

<%@ Page Language="C#" MasterPageFile="~/Home.master" AutoEventWireup="true" CodeFile="frmLogin.aspx.cs" Inherits="frmLogin" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>




   

• 
      Log in
  

   
   
   
   
 
   
     
     
   
   
     
     
   
   
     
   
   
     
   
 

	ControlToValidate="txtusername" Display="None"               ErrorMessage="Please enter username">          <%--               runat="server" Enabled="True" TargetControlID="RequiredFieldValidator1" BehaviorID="textValidator">           --%>
	ControlToValidate="txtpwd" Display="None" ErrorMessage="Please enter password">
onclick="btnlogin_Click" />                         onclick="btncancel_Click" />

   

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At cancel button the whole panel1(containing the login control created) should hide. How do i do it plzz help