To elaborate on what FALCONSEYE said, you have to use javascript. ColdFusion can't generate popups, it's a server side language, which means that the sever does all of the CF processing, turns it into html, then hands it to the user's browser. So, by the time the user sees the page, ColdFusion has already finished everything it's going to do and handed the info to the web server to give back to the user.
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