Having trouble with this simple script

1

im pretty new to actionscript. Can someone turn this to a horizontal roll out. nothing seems to work for me.

onClipEvent (load)
{
roll = false;
menu = false;
open = false;
this._visible = false;
y_start = this._y;
y_stop = 20;
y_max = y_stop + this._height;
}

onClipEvent (enterFrame)
{

mouse_x = _parent._xmouse;
mouse_y = _parent._ymouse;
menu_left = this._x;
menu_right = this._x + this._width;
menu_top = 0;
menu_bottom = this._y + this._height;
if (menu_left < mouse_x && mouse_x < menu_right && menu_top < mouse_y && mouse_y < menu_bottom)
{
    menu = true;
}
else
{
    menu = false;
} // end if
if ((roll || open) && (!open || menu))
{
    this._visible = true;
    speed = (y_max - menu_bottom) * 0.500000;
    if (y_stop - 1 < this._y)
    {
        this._y = y_stop;
        open = true;
        roll = false;
    }
    else
    {
        _y = _y + speed
    } // end if
} // end if
if (open && !menu)
{
    speed = (y_max - menu_bottom) * 0.700000 + 1;
    if (this._y < y_start + 1)
    {
        _y = y_start
        open = false;
        this._visible = false;
    }
    else
    {
        _y = _y - speed
    } // end if
} // end if

}

thanks