Restrict users to access only a specific set of web sites

We have a laptop in our Ambulance that auto-logs onto our wireless network or the hospitals network.

I want to restrict users to a specific set of web sites, that the user would need in the field.

e.g
weather.com
maps.google.com
iamresponding.com
emscharts.com

I know I can do this in the router, but I need all other clients, wireless and wired to have
unrestricted access.

I thought about using the hosts file and modifying it but it is easier to have a list of sites the user can access rather than try to think of all the websites to block.

How can I accomplish this or is there any recommended utility that would accomplish this? Preferably free.
frtoolsAsked:
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PatrickITguyCommented:
You can use a Group Policy to accomplish this.  Either a local policy or if they are on a domain a domain policy.  

I am using Group Policy Preferences to set the Security Zone websites to block or allow websites.  

You can also set them as shown in the following link:

http://www.grouppolicy.biz/tag/white-list/
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Ernie BeekExpertCommented:
You could use the hosts file. Enter an invalid DNS server in your network config and add the allowed sites to the hosts file. As long as the user is no local admin (and/or not too technical) that could be an option.
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frtoolsAuthor Commented:
We actually don't have a network at the fire hall just peer to peer but I used the content adviser in IE that should be enough as they others are too technical to bypass it.
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