I guess I could make a separate page to both send the message AND allow the user another login attempt, but I was wondering if there was a "server-side" way of giving a pop-up message to a user. I didn't see it covered anywhere in my books and it seems like something very basic that should have a method in VBScript.
Why would you want to tie up the server for a missed login? My best guess at this point is to simply make a sorry page with a link back to the login page. Don't know how busy your server is but I avoid server side wherever I can. A little here a little there all adds up.