unable to connect gtalk server using http proxy

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Hi,

I am using Gloox to develope Gtalk IM. But I an unable to connect gtalk server using http proxy.

I am unable to get exact function call for proxy:
If u know the steps for it then please let me know.

ConnectionTCPClient* conn0 = new ConnectionTCPClient( j->logInstance(),"Proxy_server", Proxy_port);
      ConnectionHTTPProxy* conn1 = new ConnectionHTTPProxy( j, conn0, j->logInstance(),"talk.google.com", 5222 );
      conn1->setProxyAuth("HTTP_PROXY_USERNAME","HTTP_PROXY_PASSWD")

Please help me.

Thanks and Regards,
Aniket Patil.

[Edit]
Added additional information provided in comments (which I then deleted)