Cylce through several different pages in a frameset?

I apologise if this has been mentioned previously, but I couldn't see a valid post.

I am trying to write a simple page as a framset that will refresh the mainFrame every 60 seconds or so, but each time it refreshes it, it needs to change the source URL for the mainFrame as well.  My intention is to be able to load one page that will cycle through some monitoring maps, there are about 6 seperate maps that I wish to cycle through.  I can't modify the code in the map pages to use meta refresh and point to the next page...

 Any help or a point in the right direction would be hugely appreciated.
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