Button to stop a repeating script?

[Michael]

Hi:

I searched but didn't find quite what I am trying to implement. Any tips on
the best way to do the following is appreciated:

I have a Start button that starts an indefinite repeat. (It downloads a bit
of information from a web site and sends an email, waiting 5 minutes until
doing it again.) I would like a Stop button to stop the repeat, but all I
can do is Cmd-. to abort it. I tried setting a global flag but that doesn't
work, at least the way I'm doing it. Ideas?

Thanks,

m