Can I and how to setup an Intranet website on limited IP?

We us IIS 7.5.  One of the website is Intranet.  We've been asked to set it up as only accessible from our internal IPs.  So user will only get the pop up login screen if they're on one of our 3 networks.  Can this be setup?  How can I set this up?  Thank you.
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lapuccaAuthor Commented:
Awesome.  Just what I'm looking for.  Many thanks.
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