upsell script

I'm going to be selling a course via clickbank and paydotcom. I will be testing the market to get metrics using paypal and 1 shoppingcart

I need to find an upsell script that will do this AFTER the first purchase is made. So after they click the buy button, the purchase is confirmed and the money is collected I then want to start my upsell process in this form:

first upsell > second upsell > third upsell > fourth upsell > thank you

The upsell process will continue regardless of if they choose each upsell or not.

Can anyone point out any good scripts I can use for this?

thanks

Let me think... html?

html or php is preferred.

dude it's just 5 pages linking to each other what you need to do

ok, but if the upsell is purchased the total order price then changes.

instead of sending a separate charge for each purchase I'm looking for something that will either automate the purchase upgrade or at least notify my payment processor so they can manually upgrade the purchase.

I just found this :

http://www.optimizeyourcart.com/

and it looks close to what I'm looking for, wandering if this can only be used with 1shoppingcart or if it can be used with paypal as well. I have sent the creator the question.