function disableButton() {
  var forms = document.forms;
  for (var i = 0; i < forms.length; i++) {
    var elements = forms[i].elements;
    for (var j = 0; j < elements.length; j++) {
      if (elements[j].type == 'submit' || elements[j].type == 'button') {
        elements[j].disabled = true;
      }
    }
  }
}