Submit Button, doing two things at once.

I need a nudge as to the best way to do something - I think I need to be
able to do call two scripts from a submit button.

I resell access to a script I maintain on my server.  A customer wants to
call this script from multiple pages on their site - say
'promo A' and 'promo B'.  The problem is that they want to be able to track
which page is calling the script.  I don't have access to modifying the
script.

The solution would seem to be to use my server logs - but I have other
companies calling this script as well.  It seems like a big deal to set
something up to cut out just this customer's domain from the logs and send
them this daily.  I also think I'd like to offload this function on them if
possible.

a) I think Javascript may be able to handle this.  From the form input page,
can I call a 'counting' script from their server, then submit the form data
normally all from one click of a submit button using Javascript onSubmit()?
I'm happy dust off the books if this is a potential solution.
b) If so, are there any real problems with using a Javascript solution such
as this. e.g. customers don't have javascript turned on.
c) Any thoughts on other ways to accomplish this?

Thanks,

Glenn

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