[cs3/as2] Need help loading external swf with seamless transitions

Hi,

I am having an issue with my transitions and loading external swfs, here is my problem:

1- I have a index.swf that contains an empty movie clip (containerClip) and about 10 buttons
2- I have 10 external clips that corresponds to the buttons, so when a user clicks one I want the current swf to slide out and at the same time the next one slide in. I have been doing these types of transitions using Kirupa’s tutorial but now I would like it to run a little more seamless. I want the user to actually see the first clip still sliding out as the second one comes in.

can any one help with this please. I have searched for a solution all over but I am not sure if I am looking for the right thing at this point.
Thanks a lot,
Petra