IFrames will help you to embed contents from external pages too. You can remove boders and make Iframe transparent to make an external content a part of your own webpage.

IFrames are useful for a wide variety of content and especially for in-site navigation where you can use on to load pages or code snippets dynamically on a page without being an AJAX programmer and without using any javascript.

Below is a demonstration of an iframe. Also you can customize apperance of the container too.