Proxy Chaining with PHP?

Anybody know how to program php to Post through multiple proxies? I am trying it using CURL.. The reason i need it is that godaddy uses a proxy to get out onto the net ( i have shared hosting) So the CURL config needs to be pointed to them, but i dont want this to be the ultimate proxy. This first proxy needs to be tunneled through to reach a second proxy and from the do the post. Any ideas?

Not many php programmers here?