since people can submit forms by hitting Enter on a text field, in which case the named submit button isn't referenced.
Just FWIW, last I heard, only IE does that. The other browsers will send a submit argument.
As for what to do to avoid that, I either check that the request is POST, or check for a required param's existence. If the request does something that is not read-only (like the OP's script seems to do), I'd very strongly consider changing the form submission to POST from GET.
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