I'm building an information directory and, in an attempt to make my site more "sticky", I would like to be able to present third-party pages within a tabbed iframe or other equivalent means. I have a sampling of the type of presentation that I have previously built in html. I have received recommendations to use various tab menus, but, I get lost with PHP, CSS, etc. I don't want to use the links to open an entirely new website. I want to open the pages in a frame, so that it is easy to browse through the pages, while remaining within my navigation system. Is there a plugin or other means that I can use to accomplish this?