Cancel_Return, Can this work n shortcode

I am trying to figure out a way to, my paypal button is on my sub-domain after someone clicks and goes to paypal but doesn’t follow thru on purchasing and they click the Cancel and Return to link on paypal checkout, I need them to return to my sales site not my https site…

I have a domain it is for sales then I have a sub-domain off of the main sales domain, the sub is for client login and is ssl, s2members doesn’t allow to have things be a mixture of both sites so I have the s2 on my ssl sub-domain and when someone clicks the cancel and return to link on paypal they are taken back to my subdomain, I want to be able to send them back to the sales and info domain…

Hopefully this makes some sort of sense and someone can help me with this, I found on the paypal developers site cancel_return shortcode, but I have no idea how to make this work or anything else…

I can not find on paypal under my account a place to tell it to return a user to a different address than they came in on when cancelling the purchase process…

Please if anyone can help or recommend anything I would greatly appreciate it…

Micheal

Can anyone explain how to enter the cancel_return varible in my s2 shortcode…

PLEASE HELP…