Flash as2 Help with mouse cursor function

Really simple task, I have a movie clip named rightHit, on the right side of the stage. When the mouse touches rightHit, a movie clip called rightArrow, is called from the library and attached to the rightHit.

What I am trying to do is when the cursor hits rightHit, the rightArrow movieclip is called from the library, attaches to the rightHit movieclip, and becomes the current cursor. So, when the user moves his mouse to the left right side of the stage, a right arrow will become the cursor. But only on the right side of the stage. The movieclip I have is 100px wide by 800px high with a 0% Alpha. I am using this as my hitTest box. I have one on the top, bottom, left and right sides of the stage. I am just trying to get one to work. So, when the user has his cursor at any of those locations(top, bottom, left, right) of the stage, the appropriate arrow movieclip will attach to the (rightHit, leftHit, topHit, bottomHit) movieclip and become a new arrow cursor(which is the movieclip being called from the library to be attached to the appropriate “hit” box movieclip).

Here is the code I have on the rightHit movieClip:

onClipEvent(enterFrame)
{
   if(this.hitTest(_root._xmouse, _root._ymouse))
   {
      this.attachMovie("goRight","goRight", 1())
      _root.goRight._x = _root._xmouse;
      _root.goRight._y = _root._ymouse;
      Mouse.hide();
}  

The movieclip attaches, but has no function with mouse. The movieclip attaches, but it isn’t becoming the current cursor.