This is a large involved script that uses one button to change multiple frames. It's hard to explain so I'll give you some options:
See It Work. Then come back to get all the files.
These files are in HTML format. When they come up, download them.
headindex.html This is the main frame page.
headliner.htm This contains the script. It will compile. Just download through a Save As command.
left1.htm
left2.htm
main1.htm
main2.htm
The file above that contains the script explains how to manipulate it for your needs.
Enjoy!
Please note: This script is being offered in simple text format. When you click to Grab the Script, the text should display. Internet Explorer and AOL users may get a blank page or the script may run and produce the effect. If this happens, choose SAVE AS from the FILE menu and save the blank or compiled page.