unable to display web page inside iframe as a popup

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ASP.NET

Javascript

I want to display my web page in a popup inside an iframe. I cant figure out what the problem is its not working. I am using the following code.

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
<div>
 <asp:Button ID="btnNewParty" runat="server" Text="New Party" />

<cc1:ModalPopupExtender ID="m1"  runat="server" TargetControlID="btnNewParty" BackgroundCssClass="ModalPopupBG" Drag="true" CancelControlID="btnCancel" DropShadow="true" OkControlID="btnOkay" PopupDragHandleControlID="PopupHeader" PopupControlID="Panel1">
        <asp:Panel ID="Panel1" Style="display: none;" runat="server" ScrollBars="Auto">

<iframe style="width: 350px; height: 300px;" id="ifrm1"  runat="server" src="MPMST.aspx" frameborder="no"
    scrolling="yes"></iframe>
<br />
<asp:Button ID="Button2" runat="server" Text="Close" />  
</div>

Most of the links have given the same code.I m doing exactly the same but still its not working.
m not using update panel also.
Newparty.aspx is a simple web page without master page.Am i missing something?
i used Style="display: block;" also for panel.But the popup itself doesnt appear.

Help me.