Simple help with actionscript for game

1

ok… im making a nav bar with a game attached. i want to have the character running around, and then you zap them. i have the whole button thing down, but i need help with the actionscript. i want the person to be moving slowly across the area, going back and forth at random heghts. this is what i have so far…

  onClipEvent (load) { 
  _root.hitz = 0; 
  this._alpha = 0; 
} 
onClipEvent (enterFrame) { 
  this._x -= _root.speedz; 
  this._rotation += 0; 
  if (this._x<=-80) { 
	this._alpha = 100; 
  } 
  if (this._x<=-380 && _root.hitz == 0) { 
	gotoAndPlay(2); 
	_root.missed += 1; 
	_root.hitz = 1; 
  }   
  if (_root._currentframe == 3) { 
	_parent.nextFrame(); 
  }   
}

im new at this whole actionscript thing, so dont be suprised if i made a huge mistake. if its any help, im basin it off of this tutorial. http://www.layoutgalaxy.com/html/htmnewletter47-page1.htm

thanks for looking.