Actionscript [MC always faces the mouse]

This formula will rotate your movieclip to where your mouse is positioned

// getting the radian
myRadians = Math.atan2(_root._ymouse-this._y, _root._xmouse-this._x);
// converting radian to degrees
myDegrees = Math.round((myRadians*180/Math.PI));
// add a rotation depending on where your MC is facing by default
this._rotation = myDegrees+180;

//this formula moves the MC towards the mouse
//

this._x += Math.sin (this._rotation * Math.PI / 180) * (2);
this._y += Math.cos (this._rotation * Math.PI / 180) * -(2);