killalert.js

(function() {
  // Temporary alert box killer - Derek Petersen
  // Store the native alert/confirm functions for later
  var _nativeAlert = window.alert;
  var _nativeConfirm = window.confirm;
  
  // Disregard all alert boxes
  window.alert = function() {
    return;
  };
  
  // Say "No" to all confirm boxes
  window.confirm = function () {
    return false;
  };
  
  // Restore native alert/confirm functions after a couple seconds
  // after the page loads
  window.onload = function() {
    setTimeout(function() {
      window.alert = _nativeAlert;
      window.confirm = _nativeConfirm;
    }, 2000);
  };
})();