function buttonfix() {

  var buttons = document.getElementsByTagName('button');

  for (var i=0; i < buttons.length; i++) {

    if (buttons[i].onclick) { continue; }

    buttons[i].onclick = function () {
      for (j=0; j<this.form.elements.length; j++) {
        if (this.form.elements[j].tagName == 'BUTTON') {
          this.form.elements[j].disabled = true;
        }
      }
      this.disabled = false;

      var input = document.createElement('input');
      input.setAttribute('name', this.name);
      input.setAttribute('value', this.attributes.getNamedItem('value').nodeValue);
      input.setAttribute('type', 'hidden');

      this.form.appendChild(input);
      this.name = '';
    }
  }
}
window.attachEvent("onload", buttonfix);