How to skip cart review form? Go directly to payment page!

Hi,
I'm using e-commerce on Drupal 5... I hear e-commerce v4 has the option to skip. Our site has already been set up in D5 and e-commerce v4 is unavailable for D5.

Basically we have a webform node set as a product. At the end of the form we want it to go straight to a payment page.

At the moment it takes you through 2 unnecessary screens:
'Cart review' and 'Please review and check your order'.

I'm overwhelmed by all the e-commerce functions... don't really know where to start.

Cheers,