var addEvent = function (elem, eventType, func) { if ( elem.addEventListener )  addEvent = function (elem, eventType, func) {   elem.addEventListener(eventType, func, false);  }; else if ( elem.attachEvent )  addEvent = function (elem, eventType, func) {   elem.attachEvent('on' + eventType, func);  }; addEvent(elem, eventType, func);};var delegateEvent = function (elem, childElems, eventType, func, args) { addEvent(elem, eventType, function (e) {  var evt = e || window.event;  var elem = evt.target || evt.srcElement;  if ( elem.nodeName.toLowerCase() == childElems.toLowerCase() ) {   func(elem, args);  } });};