Preloader with Transition problems

I have followed the Kirupa ‘preloader with dymanic files’ tutorial here:
http://www.kirupa.com/developer/mx/preloader_transition.htm

Getting that version working was no problem, but now that I have tried to implement this into a site of my own I seemed to have completely cocked it up!

see here:
http://www.simtech-software.com/

I’ve added transition links to the ‘Home’ and ‘Online Tying Guides’ links but they don’t always work and when they do, the transistion doesn’t play properly.

I’d be very grateful if anyone would mind having a quick look at the .fla files any pointing out my mistakes!!

FLA File -> site.zip

On the site everything gets loaded into the base.fla

Many Thanks.