Configuring Proxy Exceptions with NT Policies

[ITchappie]

I use a Websweeper proxy for all internet traffic and now my parent company have started an intranet and I have to bypass my proxy for the internal site. IE settings are set to use the proxy via NT policies (inetset.adm and inetres.adm) preventing users from changing the settings. Can anyone tell me how I enter a proxy exception string into these policies as I cannot see the setting for the life of me. I have a mix of EI 4, IE5 & IE6 to contend with but will end up on IE6 throughout.

Apologies if I am not making sense but I am a newbie and this is my first posting...