How do I set a variable within a 'for' loop grid array

Question

I'm afraid I'm stuck again!
The next stage in the animation that I'm working on,  is to set up a boolean, 'drilled = false', so that all instances of the attachMovie ('openCircle') have a boolean 'drilled = false' associated with them. Then when someone clicks on one of the instances of the attachMovie ('openCircle'), the boolean becomes 'drilled = true', but only for that instance that has been clicked.
What I've done is to set the variable (boolean)(highlighted in bold below) within both 'for' loops within the grid array, but it just returns an undefined value. Do I need to setup a separate array? (see code below):-
//set up grid for solid array
var spacing:Number = 5.75;
var cols:Number = 20; // number of columns in grid
var rows:Number = 20; // number of rows in grid
var leftMargin:Number = 154;
var topMargin:Number = 169;
var depth:Number = 100; // starting point for depth
var drilled:Boolean;
for (i=1; i<=rows; i++) {                                                                                                         
for (j=1; j<=cols; j++) {                                                                                                                              
          drilled[rows,cols]=false;
                    trace(drilled);
          current = attachMovie("openCircle_mc", "openCircle_mc"+i+"_"+j, depth++);
          current._x = leftMargin + ((i-1) * (spacing + current._width));
          current._y = topMargin + ((j-1) * (spacing + current._height));
          current.row=i;
          current.col=j;
//          current.oil = Math.floor(Math.random()*1.1);  // about 1/10 objects have oil=1, 9/10 oil=0
          //open circle initially invisible, visible on rollOver
          current._alpha = 0;
          current.onRelease=function(){
                    trace(this.row+" "+this.col);
   current.drilled = true;
          current.onRollOver = function() {
                                 this._alpha = 100;
          current.onRollOut = function() {
                                 this._alpha = 0;
I'd be grateful for any help. Thanks.

Answer 1

I'm sorry for asking this question again, but I really need to have the 'drilled' variable to be available at all times outside the openCircle_mc, so if I can set up the 'drilled' variable as an array that would be good. Below is the code that isn't working:
/*  set all values of 'drilled' to false  */
var col:Number = 20; // number of columns in grid
var row:Number = 20; // number of rows in grid
for (g=1; g<=row; g++) {
          for (h=1; h<=col; h++){
                      drilled[g,h] = false;
Very many thanks