Remo's free add-on http://www.concrete5.org/marketplace/addons/iframe/... should do what you're looking for.
If you are trying to add an outside page to navigation, go to sitemap - select "Home" - choose "add an outside link" from the drop-down of options
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If you are trying to add an outside page to navigation, go to sitemap - select "Home" - choose "add an outside link" from the drop-down of options