Dynamic html link tags to control loading of external swf into main movie

Sorry about the long title but I thought I better put it all there just in case some can solve this problem and other can find it easier.

1.- First :: I have a main movie which dinamicaly loads external swf files.

2.- second :: some of those external files contain dynamic html (.txt-files)

3.- third :: my problem comes here where I want a <a> tag to load a new external swf into the main movie.

Any ideas?

Please help,

Kejsaren