Why is this param undefined?
When you create the frameset, neither of the frames within has the original query string included in their URLs.
Why isn't exit stopping the script from running?
It is, but you seem to be missing a key concept about the web and frames: each frames is a seperate instance, so you're actually calling your script three times, and it's the latter two (where you've unintentionally stripped the params) that exit is stopping.
--k.
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