Proxy Binding?

Can anyone help me find a special software?

i need something very similar with HTTPort, im having problems at work to connect at my host cause its blocked on our proxy, and i have no access on it, so i need to bypass it, i have a private proxy that i bought but i cant connect on it cause the browsers have to go through the Local Proxy.

I installed HTTPort cause it has very nice options, it binds the local proxy with the destination address (the private proxy), and it opens a socks 5 proxy logically (127.0.0.1, and sorry for to much proxy's )

the only thing that i cant do with HTTPort is authenticating, the destination address (again the private proxy) requests a username and pass (of course ia have it, this is not the question of the topic, no missunderstanding)...

so the question actually is, is there anything similar with HTTPort that binds the proxies?

ps, i tryed http-tunnel with port/app adding, worked but it still limited my connection with the dest. address (free service) so i have to exclude it from the list.

Regards, Pluto.