I don't know how's your form(s) is/are built but I may suggest you:
Split your form (in case there's only one) in several forms which will contain the desired action (POST, JS custom validation function or whatever) for each button. If you want to show your code I'll be glad to take a look on Monday (yep.. weekends are sacred too :)) My e-mail is in the forum ID.

>There is another bug on my page, which Tracy found, and I would need to find a way to prevent. User may click on Add to Cart button, then immediatelly click on Select All. The checkbox become selected, but the resulting page displays a message, User doesn't select anything. E.g., I have to find a way to process my form immediatelly after the Add to Cart button is clicked, therefore user (even the quickie) would not be able to click on Select in between...