How to make a Drawing with mouse?

_root.createEmptyMovieClip(“line”,1);

_root.onMouseDown = function() {
line.moveTo(_xmouse,_ymouse);
line.lineStyle(2,0xaa3333,500);

this.onMouseMove = function() {
line.lineTo(_xmouse,_ymouse);
updateAfterEvent();
}
}
_root.onMouseUp = function() {
this.onMouseMove = null;
}