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  new Point curspos, appsize;
        Boolean _move = false;
        new Point differencepoint;
        Int32 newX;
        Int32 newY


  private void nav_mid_MouseDown(object sender, MouseEventArgs e)
        {
            _move = true;
        differencepoint = e.Location;
        }

    private void nav_mid_MouseMove(object sender, MouseEventArgs e)
        {
            if (_move) newX = (ParentForm.Location.X - differencepoint.X) + (e.X);
            if (_move) newY = (ParentForm.Location.Y - differencepoint.Y) + (e.Y);
            if (_move)  ParentForm.Location =  new Point (newX, newY);
        }


   private void nav_mid_MouseUp(object sender, MouseEventArgs e)
        {
            _move = false;
        }