Web Development

function setup_event(elem, eventType, handler)
  {
    (elem.attachEvent ? elem.attachEvent("on" + eventType, handler) : ((elem.addEventListener) ? elem.addEventListener(eventType, handler, false) : false));
  }

  function detach_event(elem, eventType, handler)
  {
    (elem.detachEvent ? elem.detachEvent("on" + eventType, handler) : ((elem.removeEventListener) ? elem.removeEventListener(eventType, handler, false) : false));
  }

function setup_event(elem, eventType, handler)
  {
    (elem.addEventListener || elem.attachEvent)((elem.attachEvent ? "on" : "") + eventType, handler, false);
  }

  function detach_event(elem, eventType, handler)
  {
    (elem.removeEventListener || elem.detachEvent)((elem.detachEvent ? "on" : "") + eventType, handler, false);
  }

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Don't worry, be happy )