function rand(min, max) {
  return min + Math.floor(Math.random() * (max - min + 1));
}

function randChars(length, charSet) {
  length = length || 8;
  charSet = charSet || "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
  var ret = "";
  while (ret.length < length) {
    ret += charSet.charAt(Math.random() * charSet.length);
  }
  return ret;
}

function rgbHex(red, green, blue) {
  var hex = (((red & 255) << 16) + ((green & 255) << 8) + (blue & 255)).toString(16);
  return '#' + '000000'.substr(hex.length) + hex;
}

function hexRgb(hex) {
  var match = hex.match(/^#?([a-f\d]{3}|[a-f\d]{6})$/i);
  if (!match) {
    return false;
  }
  hex = match[1];
  if (hex.length == 3) {
    hex = hex.replace(/(.)/g, '$1$1');
  }
  var value = parseInt(hex, 16);
  return [value >> 16, (value >> 8) & 255, value & 255];
}

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