jquery.typewriter.js

jQuery.fn.typewriter = function(text, options) {
  if (typeof(options) === 'undefined') options = {};
  if (typeof(options.wait) === 'undefined') options.wait = 50;

  if (options.wait <= 0) return this.text(text);

  var type = function(element, wait, text, i) {
    if (i >= text.length) return;
    element.insertAdjacentText('beforeend', text.charAt(i));
    setTimeout(function(){type(element, wait, text, i+1)}, wait);
  }

  this.empty().each(function(i) {
    type(this, options.wait, text, 0);
  });
  return this;
}