I am trying to pass the "allowfullsceren" flashParam to the shadowbox (v2) by using shadowbox.open(). Because the shadowbox should be opened from another flash, I am using this method. Unfortunately I cannot change to version 3 soon.
Shadowbox version 2 does not expect, or use, either flashParams or flashVars provided as options properties. You would need to change the player's source code to either hard code them, or use them if supplied as options.
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