Syntactic Sugar for moving MCs.

[Sammo]

MovieClip.prototype.move = function(direction, speed) {
switch (direction) {
case "up":
this._y -= speed;
break;
case "right":
this._x += speed;
break;
case "down":
this._y += speed;
break;
case "left":
this._x -= speed;
break;
}
}

// allows:
hero_mc.move("left", 5);

Just to make your code that bit more readable and DRY.

[Templarian]

...hmm... simple but some of the newbies might like this.

For simple explanation (just if anyone searchs and finds your thread):
http://www.kirupa.com/developer/actionscript/tricks/prototypes.htm