Redirection Question

Hello,

I hope someone can help me:

Is it possible to redirect a request to an other parent by the protokoll
it uses?

We have two proxies to the Internet, one allows ftp (b) the other (a) does not.

The internal squid-proxy of our part of the company should send
all request to proxy a - besides ftp-requests which should go to proxy b.

Thanx
        Chris

-- 
Rich Cook: "Programming today is a race between software engineers striving
            to build bigger and better idiot-proof programs, and the Universe
            trying to produce bigger and better idiots. So far, the Universe
            is winning."