var urlRegex =/(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
function linkify(text, safeText) {
  safeText = (safeText===false? false : true);
  if (safeText) text=escapeHtml(text);
  return text.replace(urlRegex, function(url) {
    return '<a href="' + url + '">' + url + '</a>';
  });
}