How to time the starting of an externally loaded movie after a specific part of main

Plz help with this…
how to time the starting of an exteranlly loaded movie after a specific part of main movie has loaded…

I have a movie called mywork.swf, which is loading thumbnails and display (the display of main clip/ image when u click on any thumbnail) externally from a movie called thumbnail_loaded.swf
Now that is working fine…
But the problem is here… in mywork.swf , I am also loading a movie called tbn_detail.swf whihc has the detail of the work displayed (from thumbnail_loaded.swf) and the serial number of the project page (like in www.albertocerriteno.com , in exhibition link click on any thumbnails and see the numbers with detail on top- thats exactly wat i want) but dont knw how to get it working…if some1 has a similar file or knws how i shd go about it plzzz help …im working on a deadline so any urgent help wld be much appreciated…

Thanks a ton