Array = new Array(20 * 20);
var i = 0;
var sy = 0;

for(var y = 0; y < 20; y++) {
var sx = 0;
for(var x = 0; x < 20; x++) {
str = "sq" + String(i);
Array[i] = this.attachMovie("sq", str, i + 1);
Array[i]._x = sx;
Array[i]._y = sy;

i++;
sx += 30;
}
sy += 30;
}