function generateCheckBoard(wantedCheckBoardSize) {

    var counter = 0,
        checkBoard = [],
        checkBoardSize = (wantedCheckBoardSize != null) ? wantedCheckBoardSize : 80;


    for (var i = 0; i < checkBoardSize; i++) {
        checkBoard[i] = [];
        for (var j = 0; j < checkBoardSize; j++) {
            checkBoard[i][j] = counter;
            (counter === 0) ? counter = 1 : counter = 0;
        }
        (counter === 0) ? counter = 1 : counter = 0;
    }

    return(checkBoard);
}

var checkBoard = generateCheckBoard();

// Affichage rudimentaire
var checkBoardString = '';
for (var i = 0; i < checkBoard.length; i++) {
    checkBoardString += checkBoard[i].toString()+'<br/>';
}
$('body').append(checkBoardString);