Is there any way to do something like this...

Click on a link called "Art Gallery" that opens something in the left frame and something else in the right frame...at the same time?

Substitute this code for the one you would normally use:

<a href="newpage1.html"
onClick="parent.left.location='newpage2.html'" target="right"> text or image </a>

newpage1.html will load on the right. newpage2.html will load on the left.

Oh wow, so it is possible. Thank you Sugar Rush. :)

Well, I tried it...but all it did was open one of the pages in a new window. Hmm...

try here...
http://www.lissaexplains.com/forum//showthread.php?s=&threadid=40793

Here is a link that uses Java script:

http://javascript.internet.com/navigation/change-2-frames-source.html