How to have the Submit Button run the Sub Routine Before Panel Sho

[AuntieAuntieAuntie]

I now have my modalpopupextender working, but to well.
Goal:
User enters ID number into textbox (working)
Clicks Submit button which run the click event connecting to db, runs st.
proc. to determine validity. (working)
If ID number not found Then (working)
Show modalpopupexter (not working)
Show Panel1
Else
Hide modalpopupextender
Hide Panel1
continue to page 2.
End If
End Sub
My code snippet:
<asp:Button ID="btnSubmit" runat="server" Height="30px"
Style="font-size: 12pt;
left: 20px; font-family: Arial, 'Microsoft Sans Serif',
'Times New Roman'; position: absolute;
top: 250px" Text="Submit" Width="71px" />

<aspanel ID="Panel1" runat="server" CssClass="modalPopup"
style="display:none;" Height="84px" Width="400px">
The Employee ID number you entered is incorrect please try
again.<br />
<asp:Button ID="btnOK" runat="server" Text="Me OK" />
</aspanel>

<ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
BackgroundCssClass="modalBackground"
DropShadow="true"
OkControlID="btnOK"
PopupDragHandleControlID ="true"
PopupControlID ="Panel1"
TargetControlID ="btnSubmit">
</ajaxToolkit:ModalPopupExtender>

Thank you.

Aunite