It might be possible to twiddle the URL called by the redirect header. Can you post the code that constructs the paypal button on your page? - the original page was offline last time I tried.

I also am offline for a while, but I'll take a look at this again tomorrow GMT.

Update: The original page is back online, and there's a possible solution. Its a bit krufty - someone might be able to come up with a cleaner approach, perhaps using javascript to change the form action from the client side, but this seems to work OK. Change your redirect URL to:

https://www.paypal.com/cgi-bin/webscr?add=1&cmd=_cart&business=MAILADDRESS&item_name=BridgeMill%20Power%20Tennis%20Camp&name=item_number=Camp05&amount=198.00&no_note=1&currency_code=USD&lc=US

This is the URL taken from the form action, with all the fields that were supplied as hidden form parameters in the html source supplied as URL parameters.

(You'll need to change the mail address to the correct one - I chopped it to combat spambots). You might also need to check your agreement with paypal to make sure you aren't obliged to display their button.

Hope this helps.