malte-j

function calcVH () {
	var vH = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
	document.querySelector('body').setAttribute("style", "height:" + vH + "px;");
}
window.onload = calcVH();
window.addEventListener('onorientationchange', calcVH, true);
window.addEventListener('resize', calcVH, true);

malte-j

function Create2DArray(rows, columns) {
  var arr = [];
  for (var i = 0; i < rows; i++) {
    var col = [];
    for (var j = 0; j < columns; j++){
      col[j] = 0;
    }
     arr[i] = col;
  }
  return arr;