Same Security Test Event on Every Page

I already have a logon screen for my existing system, and now I have menu links to several ASPRunner pages.
I would like to have the same code added at the top of every single ASPRunner page:
If Session("YNAdminAuthority") <> "Y" then

Response.Write = "Access Denied - Please logon"

Response.End

end if
Currently, I open every single page in the Wizard, click on the page-load event, and add this code.

Is there a way to add this code one time for all pages?
Thanks,

Neal

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