NEED HELP with flash Action script

// MATRIX SIMULATION 1.0
// Mike Corrigan

stop ();
var myNum:Number;
var myTimer:Number = setInterval (newClip, 40);
var counter:Number = 0;
var counter2:Number = 0;
var titleCounter:Number = 0;
var myTitle:String = new String("DEM TEK v1.0");
// format for webPage is ("www.mypage.com") or type "null" for no redirection// --- not compatible with some browsers
var webPage:String = new String(null);
var space:Boolean = false;
var alphaB:String = new String(" 1a[Z2b]Y3c|X4d}W5e{V6f'U7g;T8h.0S9i,R~j:Q'kP!lO@mN#nM$oL%  pK^qJ&rI*sH(tG)uF_vE+wD-xC=yB\zA?><\"");

_root.createEmptyMovieClip ("topLine", getNextHighestDepth());
_root.attachMovie("finish", "finish", getNextHighestDepth(), {_x: Stage.width-(this._width+10), _y: 330})
_root["finish"].theTxt.text = "decoding... 0%";
_root["finish"]._alpha = 60;
mainTitle ();
centerIt();

function mainTitle () {
	if (titleCounter < myTitle.length){
		_root.topLine.attachMovie ("myLet", "myLet" + titleCounter, getNextHighestDepth(), {_x:27*titleCounter, _y:0});
		 trace(_root["topLine"]["myLet"+titleCounter]);
		checkLets (_root["topLine"]["myLet"+titleCounter]);
		centerIt();
	}else{
		_root["finish"].theTxt.text = "decoding complete.";
		_root["finish"]._alpha = 80;
		if (webPage != "null"){
			_root["topLine"].onRelease = function(){
				// send user to web page
				getURL("http://" + webPage, "_blank", "GET");
			}
		}
	}
}
function checkLets (myObj:MovieClip) {
	// trace(myObj);
	var testCount:Number = 0;
	myObj.onEnterFrame = function(){
		myObj.myLetter.text = alphaB.substr(testCount,1);
		// the followign is a cool effect
		// Selection.setFocus(myObj.myLetter);
		if (myObj.myLetter.text == myTitle.substr(titleCounter,1)){
			_root["finish"].theTxt.text = "decoding... " + Math.floor(((titleCounter+1)/myTitle.length)*100)+"%";
			myObj.myLetter.text = myTitle.substr(titleCounter,1);
			delete myObj.onEnterFrame;
			titleCounter++;
			mainTitle();
		}else{
			testCount++;
		}
	}
}
function centerIt(){
	_root["topLine"]._x = (Stage.width/2)-(_root["topLine"]._width/2)+20;
	_root["topLine"]._y = (Stage.height/2);
}
function newClip () {
	myNum = randRange (1, 36) * 20;
	_root.attachMovie ("block2", "block2" + counter2, getNextHighestDepth (), {_x:myNum, _y:-10});
	myMove (_root["block2" + counter2]);
	counter2++;
}
function randRange (min:Number, max:Number):Number {
	var randomNum:Number = Math.floor (Math.random () * (max - min + 1)) + min;
	return randomNum;
}
function myMove (myObj:MovieClip) {
	myObj.onEnterFrame = function () {
		if (myObj._y < 400) {
			myObj._y += 20;
			_root.attachMovie ("chars", "chars" + counter, getNextHighestDepth (), {_x:myObj._x, _y:myObj._y});
			_root["topLine"].swapDepths(getNextHighestDepth());
			_root["chars" + counter].gotoAndStop (randRange (1, 40));
			myAlpha (_root["chars" + (counter - 1)]);
			counter++;
		} else {
			removeMovieClip (myObj);
			delete myObj.onEnterFrame;
		}
	};
}
function myAlpha (myObj:MovieClip) {
	myObj.onEnterFrame = function () {
		if (myObj._alpha > 0) {
			myObj._alpha -= 5;
		} else {
			delete myObj.onEnterFrame;
			removeMovieClip (myObj);
		}
	};
}