Transition - external swf

Wondering if anyone can help on this transition…

I have, let say, 10 external swf files (each containing an image) for an photo gallery.

The first ext. swf. does a preload and then image comes up once loaded.

Then (here’s where I need the help), how can I make sure the next external swf file that is selected preload and do the loading “on top of the existing swf” no matter which image swf I select?

I want the ext. swfs to do a preload and load while the prior selected swf. is still in the background until the new swf is loaded?

An example is done by group94 at this link:

http://www.margecasey.com/