Transision / preloader question

I was working with a transition between external SWF files like is done in this tutorial [COLOR=#333333]http://www.kirupa.com/developer/mx2004/transitions.htm[/COLOR] and added preloaders for every SWF.
when you click on a section button it first runs the previous section and then it loads the other section.
What i want is to let the previous section to still be visable when clicking on a new section.
So lets say section 1 is active and when i click on section 2 the preloader should apair and load in section 2 and then close section 1 and then run section 2 is this possible ? i have seen this techniques used on other site but dont know how to do it.
Anybody knows a tutorial or have some source files ? or some other info ?

hey, just wondering if you found the answer to ur question as im looking for the same. Its used in this site
http://www.samanthamumba.com/site/site.php