For loop movie name problem

Hi all, I am very new to the AS and I got confused when I tried to turn the following code using just a for loop. how am I suppose to deal with the name of the movieclip?

I attached a movieClip from the library called “tab” into menuHolder, there are five of them. menuHolder.tab0/menuHolder.tab1/menuHolder.tab2/menuHolder.tab3/menuHolder.tab4

now I want to create a MovieClip call [“arr”+i] inside the [“tab”+i] and draw a square in each one of them. The createMovieClip part is successful. but when I want to put the whole thing into a for loop to cut down some lines, I have trouble calling out the [“arr”+i]movieclip.

How am I suppose to call it?
should it be something like this? of i did something wrong?
for(i = 0; i<NumberMovieWant; i++){
menuHolder[“tab”+i].createEmptyMovieClip(“arr”+i,menuHolder[“tab”+i].getNextHighestDepth());
menuHolder[“tab”+i].arr*.beginFill(0xcccccc, 60);

}

thank you.

    if(i == 0){
    menuHolder["tab"+i].createEmptyMovieClip("arr0",menuHolder["tab"+i].getNextHighestDepth());
    menuHolder["tab"+i].arr0.beginFill(0xcccccc, 60);
    menuHolder["tab"+i].arr0.moveTo(0, 0);
    menuHolder["tab"+i].arr0.lineTo(100, 0);
    menuHolder["tab"+i].arr0.lineTo(150, 150);
    menuHolder["tab"+i].arr0.lineTo(100, 298);
    menuHolder["tab"+i].arr0.lineTo(0, 298);
    menuHolder["tab"+i].arr0.endFill();
    
    menuHolder["tab"+i].arr0.onRollOver = menuOver;
    }
        
    if(i == 1){
    menuHolder["tab"+i].createEmptyMovieClip("arr1",menuHolder["tab"+i].getNextHighestDepth());
    
    menuHolder["tab"+i].arr1.beginFill(0xcc00cc, 15);
    menuHolder["tab"+i].arr1.moveTo(500, 0);
    menuHolder["tab"+i].arr1.lineTo(640, 0);
    menuHolder["tab"+i].arr1.lineTo(695, 150);
    menuHolder["tab"+i].arr1.lineTo(640, 298);
    menuHolder["tab"+i].arr1.lineTo(500, 298);
    menuHolder["tab"+i].arr1.lineTo(550, 140);
    menuHolder["tab"+i].arr1.endFill();
    
    menuHolder["tab"+i].arr1.onRollOver = menuOver;
    }
    
    if(i == 2){
    menuHolder["tab"+i].createEmptyMovieClip("arr2",menuHolder["tab"+i].getNextHighestDepth());
    
    menuHolder["tab"+i].arr2.beginFill(0xcc00cc, 15);
    menuHolder["tab"+i].arr2.moveTo(500, 0);
    menuHolder["tab"+i].arr2.lineTo(640, 0);
    menuHolder["tab"+i].arr2.lineTo(695, 150);
    menuHolder["tab"+i].arr2.lineTo(640, 298);
    menuHolder["tab"+i].arr2.lineTo(500, 298);
    menuHolder["tab"+i].arr2.lineTo(550, 140);
    menuHolder["tab"+i].arr2.endFill();
    
    menuHolder["tab"+i].arr2.onRollOver = menuOver;
    }