Onclipevent problem with mouse over

I have a scrolling slideshow that scrolls left or right depending which way you move the mouse.  When you hover a picture the text changes at the bottom, however I want to set it so that when you mouseoff it switches to a generic text.  I have coded the actionscript for the message switching as
onClipEvent (enterFrame) {
      if (this.hitTest(_root._xmouse, _root._ymouse, true)) {
            over = true;
            if (_alpha>0) {
                  _alpha -= 5;
            _root.getinfo(substring(_parent._name,7,1));
            }
      } else {
            over = false;
            if (_alpha<50) {
                  _alpha += 5;
            _root.getstandby(substring(_parent._name,7,1));
            }
      }
}

The problem is that when I move the mouse left to right off the current picture it defaults to the standby string of text and doesn't change with each picture.  I only want the standby if my mouse isn't over any pics.