Event handler in multiple browsers

EventUtil.js

var EventUtil = {

    addHandler: function (element, type, handler) {
        if (element.addEventListener) { // DOM2
            element.addEventListener(type, handler, false); // false means handle the events when bubbling
        } else if (element.attachEvent) { // IE
            element.attachEvent("on" + type, handler);
        } else { // DOM0
            element["on" + type] = handler;
        }
    },

    removeHandler: function (element, type, handler) {

        if (element.removeEventListener) {  // DOM 2
            element.removeEventListener(type, handler, false);
        } else if (element.detachEvent) {   // IE
            element.detachEvent("on" + type, handler);
        } else {  // DOM 0
            element["on" + type] = null;
        }
    },

    getEvent: function (event) {
        return event ? event : window.event;
    },

    getTarget: function (event) {
        return event.target || event.srcElement;
    },

    preventDefault: function (event) {
        if (event.preventDefault) {
            event.preventDefault();
        } else {
            event.returnValue = false;
        }
    },

    stopPropagation: function (event) {
        if (event.stopPropagation) {
            event.stopPropagation();
        } else {
            event.cancelBubble = true;
        }
    }
};