gistfile1.js

  $('button[type="submit"]').bind('click', function() {
    this.setAttribute('originalValue', this.innerHTML);
    this.disabled=true;
    this.innerHTML='Submitting...';
    result = (this.form.onsubmit ? (this.form.onsubmit() ? this.form.submit() : false) : this.form.submit());
    if (result == false) { this.innerHTML = this.getAttribute('originalValue'); this.disabled = false };
    return result;
  });