// Generic cross-browser code for attaching events to elements
// You should really have this in a separate common JS file
var addEvent;
if (document.addEventListener) {
  addEvent = function(element, type, handler) {
  element.addEventListener(type, handler, null);
  if (element.href) element.href="javascript:void(”);" ;
  }
}
else if (document.attachEvent) {
  addEvent = function(element, type, handler) {
    element.attachEvent("on" + type, handler);
    if (element.href) element.href="javascript:void(”);" ;
  }
}
else {
  addEvent = new Function; // not supported
}

// Set up
addEvent(window, "load", setUpHumanTest, false);
function setUpHumanTest() {
  var myforms = document.getElementsByTagName("form") ;
  for (var i=0; i<myforms.length; i++) {
    addEvent(myforms[i], "focus", markAsHuman, false);
    addEvent(myforms[i], "click", markAsHuman, false);
  }
}
// Identify a human
function markAsHuman() {
  document.getElementById("userishuman").value = "true";
}