Прости. Я очень плохо разбираюсь.
Вот сделал:

Код:
public function Arrow() {
addEventListener(Event.ENTER_FRAME, Update);
addEventListener(Event.ADDED, Random );
}
private function Random() {
flag=0;
x=0;
y=0;
lemx=parent.width;
lemy=parent.height;
xs=Math.random()*5;
ys=Math.random()*5;
}
теперь ошибки такие:
ArgumentError: Error #1063: Argument count mismatch on main::Arrow/::Random(). Expected 0, got 1.
at flash.display::Sprite/flash.display:Sprite::constructChildren()
at flash.display::Sprite$iinit()
at main::Main$iinit()
at flash.display::Sprite/flash.display:Sprite::constructChildren()
at flash.display::Sprite$iinit()
at flash.display::MovieClip$iinit()
at test_fla::MainTimeline$iinit()
ArgumentError: Error #1063: Argument count mismatch on main::Arrow/::Random(). Expected 0, got 1.
at flash.display:

isplayObjectContainer/addChild()
at main::Text$iinit()
at flash.display::Sprite/flash.display:Sprite::constructChildren()
at flash.display::Sprite$iinit()
at flash.display::MovieClip$iinit()
at test_fla::MainTimeline$iinit()