Is it possible to have a contentpane load a URL instead of an actual file?

For example, in the contentpane GUI I can ONLY select a file, input text or HTML directly, or select a link (which I'm not sure how to use yet) but I can't actually add anything else.

What is I wanted to load a page that is alreay on the web say my current homepage (which uses a CMS). URL's load like this one to my homepage
http://www.nsfilms.com/index.php?mod...page&PAGE_id=1