Follow this tutorial to learn how to use one button to change two or more frames in one shot. http://www.htmlgoodies.com/tutorials/frames/article.php/3479211
Think frames -- but frames within a page that act just the same as full-screen frames. This is how you do it. http://www.htmlgoodies.com/tutorials/frames/article.php/3479271
This is a basic introduction to frames covering the commands and what they do to the browser screen. http://www.htmlgoodies.com/tutorials/frames/article.php/3479241
So if frames are not all that and a bag of chips, why on Earth would you want to learn them? http://www.brainbell.com/tutorials/HTML_and_CSS/TOC_Working_With_Frame...
I suppose you have basic html skills and you know all about iframes, but do you know how to setup iframe to be transparent?! http://www.toxiclab.org/tutorial.asp?ID=51