[Zope] redirect to a https server sending post parameters

Hi to everyone, I'm building an e-commerce website using zope and I've come to a problem I don't know how to solve. I'm trying to make a redirect to the bank server from a python external method but the page which I'm trying to redirect only accepts parameters sent using a post method. Doing a little of research I've found out a very close solution at http://mail.zope.org/pipermail/zope/2003-March/132569.html using M2Crypto and urllib. The problem is I need to do a redirect insted of returning the bank's page as if I was serving it. Does anyone know how to do this? Any help would be greatly appreciated as I'm really stuck. Thanks a lot in advance, Toni.