Breakout game

I’m having trouble with this breakout game…I used the actionscript tutorial on this site, but I’m having trouble making the bricks be centered in my 120x600 game area…I have pasted my actionscript for the bricks below, but I don’t really understand actionscript that well yet. I don’t understand this line in particular [color=red]brick_mc = this.timeline.createEmptyMovieClip (“brick_board”,1); [/color][color=black]where did brick_mc & “brick_board” come from? can I edit brick_mc & “brick_board”? I took this code directly from the pong game tutorial in actionscript on kirupa.com[/color]. Any help would be greatly appreciated. I would post the entire FLA but it keeps saying it is too big.

Game.prototype.initBricks = function (myMap) {
brick_mc = this.timeline.createEmptyMovieClip (“brick_board”,1);

// size of the bricks

var h = 12;

var w = 24;

var c = 0;

for (var i in myMap) {

for (var j in myMap*) {

if (myMap*[j] != 0) {

var cl = brick_mc.attachMovie ("brick", "b"+c, c);

cl._x = j * w + this.left + w ;

cl._y = i * h + this.up + h ;

cl.life = myMap*[j];

c++;

}

}

}