[F8] 360 rotation by increments

I'm trying to rotate a movie clip. Simple enough?

Code:

---

                        dpx = _x-destx;
                        dpy = _y-desty;
                        distance = Math.sqrt(Math.pow(dpx, 2)+Math.pow(dpy, 2));
                        angle = Math.round(180*Math.atan2(dpy, dpx)/Math.PI)-90;
                        if (angle>180) {
                                angle -= 360;
                        } else if (angle<-180) {
                                angle += 360;
                        }
                        if (_rotation<angle) {
                                _rotation+=rot;
                        } else if (_rotation>angle) {
                                _rotation-=rot;
                        }

---

rot is the increment that I want the MC to rotate at. it equals 1 at present. destx and desty are the destination x,y coordinates of my MC.

I'm having a hard time explaining this. The MC needs to be able to rotate to angle using the increments, but as we all know, _rotation goes from -180 to 180. Therefore, the MC rotates allllll the way back around (ie, it doesn't rotate the shortest distance) to get to the opposite "side."

I want this because I don't like that my MC would instantly jump to whatever angle the destination is at and then move. It's for aesthetics. I just need another brain to help me think about this.

I normally convert all the angles between 0 and 360 degrees. Now find 2 destination angles:

dist1 = Math.abs(angle - _rotation)
dist2 = 360 - dist1

If(dist1 < dist2){
//turn toward angle
}else{
//turn toward angle+360
}