Image moving around - detecting border of SWF and bouncing

Hi there, I am a bit of a newbie here and I've got a very silly problem. I've got an image moving around my SWF depending on what side of the .swf file the mouse cursor is.

Here it is: http://supr.is-a-geek.org/psd/flash.html

The problem is prolly very obvious: the image disappears when it should detect the border of SWF and bounce back.

here is the script for moving aorund:

code:

---

onClipEvent (load) {

	x = 0;

}

onClipEvent (enterFrame) {

	this._x += x;

	if ((_root._xmouse>0) && (_root._xmouse<50)) {

		if (x>-3) {

			x -= 0.15;

		}h

	}

	if ((_root._xmouse>715) && (_root._xmouse<765)) {

		if (x<3) {

			x += 0.15;

		}

	}

}

---

Any help would be much appreciated. Thanks!

code:

---

onClipEvent (load) {

        x = 0;

        // you'll need to adjust both of these quantities.

        minX = -400; // minimum value for this._x

        maxX = 400; // maximum value for this._x

}



onClipEvent (enterFrame) {

        if (x < 0)

        { 

          if (this._x + x < minX) this._x = minX;

          else this._x += x;

        }

        else if (x > 0)

        {

          if (this._x + x > maxX)this._x = maxX;

          else this._x += x;

         }

        // simplified these...

        if (_root._xmouse<50) {

                if (x>-3) {

                        x -= 0.15;

                }

        }

        if (_root._xmouse>715) {

                if (x<3) {

                        x += 0.15;

                }

        }

}

---

Yay! It works and I even understand it! =) Thanks a lot!