function linkify(text) {
  var exp = /(\bhttps?:\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
  return text.replace(exp,"<a href='$1'>$1</a>"); 
}

function rng(max) {
  return Math.floor(Math.random() * max);
}