External swf on page load - no buttons

All the tutorials I have found across the web is loading external swf’s with a button click. My fla has 3 already created mc’s on the stage that need to load 3 different swf’s. First one loads a random selection from 5 swf’s and that one works. But when I add the other two they do not work. This is whats on my first frame of the main file:

choice = Math.round(Math.random()*4);
switch (choice) {
case 0 :
case 1 :
case 2 :
case 3 :
case 4 :

This works but I need to have 2 more holders mc names loadContext and loadLegend, that load the files one named “context.swf” and other “legend.swf” respectively.
I cant figure out how to make this second part work. I have the file on this link
(too large to put here)

Please help!