problem javascript method

hi,

i have the following:

ScriptManager.RegisterStartupScript(Page, Page.GetType(), "closeWindow", "submitWindow();", true);

DoSomeMethod();

javascript will close the window but the windows is closed after DoSomeMethod() is executed. what is the reason behind that? i cann't figure it out...

        function submitWindow()
        {
            window.close();
        }

i want to close the windows before DoSomeMethod() is executed...

how can i do this?

thanks