Duplicating movieclips & placing them with equal spacing

hi guys,

pls give me a solution as to how to duplicate a MovieClip 10 times using ‘duplicateMovieClip’& place each instance
of the new clip with equal spacing when the frame starts.

. instance name of my MC on stage i.e. to b duplicated is **bt_mc **& it is the y position i.e is to b changed.