Font and text Format being stupid

programming flash
1

hey guys im trying to make my fone set toArial. It wont work:(
heres what i have tried.

_root.createTextField("menit"+num+i, D*2, this._x+12, Y, _root["men"+num]._width, 50);
    _root["menit"+num+i].selectable = false;
    var my_format:TextFormat = new TextFormat();
    my_format.font = "Arial";
    _root["menit"+num+i].text = list*;
    _root["menit"+num+i].setTextFormat(my_format);


_root.createTextField("menit"+num+i, D*2, this._x+12, Y, _root["men"+num]._width, 50);
    _root["menit"+num+i].selectable = false;
    var my_format:TextFormat = new TextFormat();
    my_format.font = "Arial";
    _root["menit"+num+i].text = list*;
    _root["menit"+num+i].setNewTextFormat(my_format);

neither work any ideas?