Chcking for the existance of a movie clip by its instance name

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hey, i'm working on as2 stuff , in 1 function have used

_root.attachmovie("box_mc", "box"+boxcount, _root.getnexthighestdepth());

to attach few boxes on stage(expecting 100+)...

what want (from different function) check see if box exists string of instance name e.g. ifmovieclipexists("box3");

is there function this?

cheers,
jamey

movieclipexists = _root.box3 <> undefined;

//will true if clip exists , false if not


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