Attach an event

bindevent.js

function bindEvent(el, eventName, eventHandler, bubble) {
  var handler;
  // http://net.tutsplus.com/tutorials/javascript-ajax/the-essentials-of-writing-high-quality-javascript/
  // http://www.quirksmode.org/js/events_order.html#link9
  handler =
      function (e) {
        if (!bubble) {
          if (!e) e = window.event;
          e.cancelBubble = true;
          if (e.stopPropagation) e.stopPropagation();
        }
        eventHandler(e);
      };
  if (el.addEventListener) {
    el.addEventListener(eventName, handler, !bubble);
  } else if (el.attachEvent) {
    el.attachEvent('on' + eventName, handler);
  }
}