オレオレ addEvent

gistfile1.js

function addEvent(element, type, handler, data, context) {

    if (!element) { return false; }
    if (!handler) { return false; }

    context = context || element;

    var fn = function (e) {

        e = e || win.event;

        if (!e.target) {
            e.target = e.srcElement;
        }

        if (!e.stopPropatation) {
            e.stopPropagation = function () {
                e.cancelBubble = true;
            };
        }

        if (!e.preventDefault) {
            e.preventDefault = function () {
                e.returnValue = false;
            };
        }

        e && (e.data_obj = data);

        if (handler.call(context, e) === false) {
            e.stopPropagation();
            e.preventDefault();
        }
    }

    if (element.addEventListener) {
        element.addEventListener(type, fn, false);
    } else if (element.attachEvent) {
        element.attachEvent('on' + type, fn);
    }

}