Tunneling other protocols over TCP port 80

[Bruno Negrão]

Hi guys,

I need to create a VPN to my linux server from a remote workstation(windows) 
inside a private network of another company. The LAN where the workstation is 
located is protected by a firewall. This firewall only lets pass through 
outgoing traffic to port 80(http).

I need this workstation to telnet a telnet server inside my private network. Is 
it possible to set up a tunnel over port 80 to create a VPN between the 
workstation and my gateway, so that the workstation can telnet my internal 
server?

The network administrator where this workstation is located is inaccessible, so 
I have to create this workaround.

Thank you,
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Bruno Negrao - Support Analyst
Engepel Teleinformática. 55-31-34812311
Belo Horizonte, MG, Brazil