The duplicateMovieClip() function's syntax is as follows:
duplicateMovieClip(target, newname, depth)
In our example, target is the trail MovieClip.
Depth should be unique for every duplicated MovieClip. The above code sets a depth starting from id+10. So, the depth of the first few duplicated MovieClips will be 11(1+10), 12(2+10) 13(3+10) and so on.
newname is the new name for the duplicated MovieClip. In our case, the duplicated MovieClips will have the names as trail1 ,trail2, trail3, etc. All the duplicated MovieClips will be placed under _root. So, we can address the duplicated MovieClips as _root.trail1, _root.trail2, _root.trail3, etc.
We can also address the duplicated MovieClips as _root["trail1"], _root["trail2"], etc. _root["trail1"] is the same as _root.trail1.
_root["trail"+id] evaluates to _root.trail1, _root.trail2, etc. when id=1, 2 and so on.
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Custom Trailing Cursor in Flash MX
