Rotating slow down

programming flash
1

Sorry for my english!

Help please!
I try writing code for my movie, i need this movie rotate and when i release him - this slow rotation down. This must look as whirligig.
Any ideas?

Big Thanks!!!


this.onPress = function () {
    pressing = true;
    speed=100;
    old_x=_root._xmouse;
};
this.onRelease = onReleaseOutside =  function () {
    pressing = false;
    new_x=_root._xmouse;
    speed=new_x+old_x/2;
};
this.onEnterFrame = function () {
    if (pressing == true) {
        myRadians = Math.atan2 ((_root._ymouse - this._y), (_root._xmouse - this._x));
        myDegree = Math.round (myRadians * 180 / Math.PI);
        this._rotation = myDegree;
    }else if(pressing == false){
        speed--;
        this._rotation-=speed;//[COLOR=DarkRed](??? what i make wrong?)[/COLOR]
    }
};