Random MovieClip script not selecting from all possible outcomes

Question

i have a collection of movie clips (mc0, mc1, mc2...etc etc),
and when motion is detected on a webcam, one of these clips is shown on the stage.
however, for some reason only mc0, mc1 and mc2 are being displayed,
and i cannot get mc3, mc4 or any more to be chosen.
Code:
import flash.filters.*
// Assumes a Video object named "myVideoObject" is on the Stage
active_cam = Camera.get();
filterList = [
                 /* 0 */ "multiply",
                 /* 1 */ "multiply",
                 /* 2 */ "multiply",
                /* 3 */ "multiply",
                /* 4 */ "multiply"
positionList = [
                 /* 0 */ {_x: 512, _y: 288},
                 /* 1 */ {_x: 512, _y: 288},
                 /* 2 */ {_x: 512, _y: 288},
                /* 3 */ {_x: 512, _y: 288},
                 /* 4 */ {_x: 512, _y: 288}
myVideoObject.attachVideo(active_cam);
active_cam.setMotionLevel(95, 100);
active_cam.onActivity = function(mode)
    trace(mode);
     var randId = Math.floor(Math.random() * 5);
     var init = positionList[randId];
     /* old init... {_x: Math.random() * _root._width, _y:Math.random() * _root._height}; */
     var depth = _root.getNextHighestDepth();
     var movieId = "mc" + randId;
     if(mode) {
          var mc = _root.attachMovie(movieId, movieId + depth, depth, init);
          mc.blendMode = _root.filterList[randId];
I had the first three working fine, so when i added 2 more to the Filter and position Lists, and changed
the Mathrandom mutliplier to 5 instead of 3, i thought that would work.
Im really stumped, id like the script to choose from many more than 3 movie clips

Answer 1

You should put a trace to check the movieId value to confirm that the code calls for movies > 2.
The random selection code should be fine as is, so you may have to wait a bit to see one of the movies you say is not displaying.  If you were to increase the number of them, the chances of seeing some in the range > 2 is better.  The only thing I can think of from your code that might prohibit showing something > 2 is the mode value, since that's the only thing that prohibits display of anything.
I am not at all familiar with video cams andactionscript regarding them, but would it be necessary to clear out the current mc# from being present/active before adding a new one?