JS: Randomize DOM BG color

bg_random.js

function changeBGColor() {
  document.bgColor = document.colorChange.text.value;
  document.colorChange.colorValue.value = '';
}
function randomBG() {
  var h1 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var h2 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var h3 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var h4 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var h5 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var h6 = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
  var bg='#'+h1[Math.floor(Math.random()*h1.length)]+h2[Math.floor(Math.random()*h2.length)]+h3[Math.floor(Math.random()*h3.length)]+h4[Math.floor(Math.random()*h4.length)]+h5[Math.floor(Math.random()*h5.length)]+h6[Math.floor(Math.random()*h6.length)];
  document.bgColor = bg;
}
function timedChange() {
  hexChanger = setInterval('randomBG()', 10); // Speed Adjustment
}
function timedChangeStop() {
  clearInterval(hexChanger);
}