this.onMouseMove = function() {

constrainedMove(bg_mc, 4, 1);

};

function constrainedMove(target:MovieClip, speed:Number, dir:Number) {

var mousePercent:Number = _xmouse/Stage.width;

var mSpeed:Number;

if (dir == 1) {

mSpeed = 1-mousePercent;

} else {

mSpeed = mousePercent;

}

target.destX = Math.round(-((target._width-Stage.width)*mSpeed));

target.onEnterFrame = function() {

if (target._x == target.destX) {

delete target.onEnterFrame;

} else {

target._x += Math.ceil((target.destX-target._x)*(speed/100));

}

};

}