window.onload = function() {

  $("sandbox").innerHTML = "Click Here!<br/>";

  $("sandbox").onclick = function(ev) {
    ev = ev || window.event;
    $("sandbox").innerHTML =
      "<p> Clicked at " + new Date() + ". Event: " + ev + ".</p><hr/>";

    for (property in ev) {
      var message = "Property " + property + ": " + ev[property] + "<br/>";
      $("sandbox").innerHTML += message;
    }
  };
}

function $(id) { return document.getElementById(id); }