I am trying to produce a menu navigation bar simalar to that on 3dworld

The swf request also contains a tag which I assume is loaded into a variable and then the swf jumps to the correct part in the movie.

the html code below uses movie.swf?sectionID=3

<PARAM NAME=movie VALUE="/_flash/navigation6b.swf?sectionId=3">

do you have to set up a variable called sectionID
and use an if sectionID == 3 then goto play script??