My specific necessity is include in a web page (with header, footer, menu, etc.) an external website (with login access and more links includes in the external url).
Now I'm using a lightbox to open the page.
I'd like include the external webpages in the primary website, but I don't like use the iframe technical (problems with height and browser compatibility).
I had found very interesting the technical used from wufoo for their forms (javascript embed).
new-javascript-embed-form-code-snippet/