Changing Color using Identifier in AS2?

You could use a loop and change them somewhat all at once... the eye would not be able to detect them being done sequentially at loop speed.   You can either name them all similarly with a numeric sequence (box1,box2,box3,etc) and use bracket notation to loop thru them, or you could place the names in an array and loop thru the array.

for(i=1; i<numBoxes; i++){

     this["box"+i]..... change its color however you plan to

}

OR

var boxes = new Array (box1,box2,box3,etc);

for(i=1; i<boxes.length; i++){

     boxes..... change its color however you plan to

}