Try to call return false in the OnClientClick event of the button which opens the dialog:
|<asp:Button ID="Button5" CssClass="btn" runat="server"|
Text="Labs" OnClientClick="openWin('Labs.aspx'); return false;" />
Another thing to try is to place the return false after the diag.show() method:
var parent, options, diag;
options = new ACT.ModalWindowOptions(280, 510);
diag = new ACT.ModalWindow(alarmDiagURL, options, true);
If the above does not help, please provide a sample runnable project/page which showcases the issue.
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