preloader mc must play at least once

i have preloader made , works fine, want add "and" statement if statement says;

if(_root.getbytesloaded() == _root.getbytestotal()) {
gotoandplay(3);
}
able add (theoretically) "and frame of movieclip equals @ least 50" "if" statement. problem is, don't know how translate action script.

the preloader typical bar (which getting bytes loaded) movie clip in background make little smoother. i've tried using "_currentframe", think gets frame of when action takes place mouse click.

my version of action script looks doesn't work.
if(_root.getbytesloaded() == _root.getbytestotal() && movieclipname._currentframe >49) {
gotoandplay(3);
}

ok, figured out can in fact use _currentframe, still need know how add "and" statement existing "if" statement.

any reply appreciated if "your animation stupid. so, don't worry it."

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