Changing true.false vars...(flash8)

here is my code:

_root.rfast = false;

rocklee.onEnterFrame = function() {

if(_root.rfast == false) {
moveSpeed = 5;
}
if(_root.rfast ==true) {
moveSpeed = 8;
}
if(Key.isDown(Key.RIGHT)) {
this._x += moveSpeed;
dir = “right”
this.gotoAndStop(2);
this._xscale = 100;
}
else if(Key.isDown(Key.LEFT)) {
this._x -= moveSpeed;
dir = “left”
this.gotoAndStop(2);
this._xscale = -100;
}
else if((dir == “right”) && Key.isDown(Key.CONTROL)) {
this.gotoAndStop(3);
this._xscale = 100;
}
else if((dir == “left”) && Key.isDown(Key.CONTROL)) {
this.gotoAndStop(3);
this._xscale = -100;
}
}

i need to know where i need to state that the variable “rfast” is true. what i want is to make it so when i play a certain animation, the char. gets faster. the way i set it up is, the char. is a MC on the 1st frame, inside that is a few more frames, which are MC’s that hold the animation. let me know if thats confusing, cause im a little confused and im writing it.