[Hauts]

Mouse.hide();
var leftBorder = 100;
var rightBorder = 200;
var topBorder = 100;
var bottomBorder = 200;
this.onMouseMove = function(){
    var xm = _root._xmouse;
    var ym = _root._ymouse;
    this._x = (xm < leftBorder) ? leftBorder : ((xm > rightBorder) ? rightBorder : xm);
    this._y = (ym < topBorder) ? topBorder : ((ym > bottomBorder) ? bottomBorder : ym);
    updateAfterEvent();
}

Пишите код в кадре.