IE Proxy Settings via GPO

Good Day,

I setup a GPO on our network to specify what proxy server IE should use for a certain AD group. It works fine and everything is great, however; for my laptop users in this group when they take their computer home they can?t browse the web form their personal internet connection. This is because IE is setup to use our proxy server in the office. I also have the GPO setup to not allow them to change this setting.

I would like IE to use the proxy server I have specified in the policy only when their in the office. When they leave the office and use their laptops at home the proxy server settings should not be setup in IE; allowing them to browse the web. Is there a way to accomplish this?

oz