var grid = []; var RowCells = 3; function initGrid() {
      for (var nRow = 0; nRow < RowCells; nRow++) {
          grid[nRow] = [];         for (var nCol = 0; nCol < RowCells; nCol++) {
              grid[nRow][nCol] = -1;         }     } } function showGrid() {
      for (var nRow = 0; nRow < RowCells; nRow++) {
          for (var nCol = 0; nCol < RowCells; nCol++) {
              document.write(grid[nRow][nCol] + ' ');         }         document.write('
');     } } var position = {
      nRow: 0,     nCol: 1 } function fillData() {
      for (var nData = 1; nData <= RowCells * RowCells; nData++) {
          grid[position.nRow][position.nCol] = nData;         getNextPosition()     } } function getNextPosition() {
      var newRow = (position.nRow - 1 + RowCells) % RowCells;     var newCol = (position.nCol - 1 + RowCells) % RowCells;     if (grid[newRow][newCol] == -1) {
          position.nRow = newRow;         position.nCol = newCol;     }     else {
          position.nRow = (position.nRow + 1) % RowCells;     } } initGrid(); fillData(); showGrid();