PAC file for F5 SSLo Explicit Proxy

Hi,

We have a requirement from client that if they will access Internet they need to use our F5 Explicity Proxy setting "<ip address>:<proxy port>" when they're are in their corporate network.

But if their laptop is out of Corp Network, they should not use the F5 Explicit Proxy defined.

Questions.

1. Is this possible thru PAC file?
2. If possible thru PAC file, where can we get an F5 SSLo template for this requirements?

Hoping for your immediate reply if you have also experience this kind of requirements.

Thanks much.