function delegatedEventCallbackHandle(e) {
	            var evt = global.event ? global.event : e;
	            var target = evt.target;
	            var eleArr = document.querySelectorAll(selector);
	            for (var i = 0; i < eleArr.length; i++) {
	                if (target === eleArr[i]) {
	                    callback.call(target);
	                    break;
	                }
	            }
	        }
simple event delegate method

 @param {String} evtType event name
 @param {String} selector the simple css selector like jQuery
 @param {Function} callback event callback
 @public

 @alias iSliderPrototype.bind