Banner to Order Tracking

Hey, all!  ;-)

Hope someone out there in Techniques-land has some solutions/suggestions 
that have eluded me thus far.

Have a client whose site is on one server and his shopping cart application 
(ready built, all he had to do was customize) with another company.  To 
date this has worked fine - he just linked from the front-end 
informational/marketing site to the store with all the bells & whistles for 
online shopping.

Here is the logistics:  Banners on various outside sites,  main site on 
server 2, shopping cart application is on server 3.

They now want us to come up with a solution that will have the ability that 
when a link or a banner is clicked on from an outside site to be able to 
track that exact click-thru all the way to if an order is placed so that 
they can then have "revenue sharing" with the sites that have the 
banner/link. Doesn't want to spend the $$$  for a Linkshare Affiliate 
program because there are not guarantees.  But then says if Amazon can do 
it why can't he...... I know, that's another thread.  ;-)

I believe the fact that since the cart system is on a third party server 
that really is not in our complete control (other than to customize 
functionality and options) that this would implausible.  <?>  Anyone been 
there, done this?  Bottom line is to be able to track from the banner/link 
click to the placement of an order.

Any suggestions, programs or pointers in the right direction would be most 
appreciated!  ;-)

TIA!
/j

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