function registerEvent(object, event, handler) {
    if (!(object && event && handler))
        return;

    var events = object[event + 'Events'];
    if (!events) {
        object[event + 'Events'] = object[event] ? [object[event], handler] : [handler];
        object[event] = _eventHandler;
    }
    else
        object[event + 'Events'][events.length] = handler;
}

function unregisterEvent(object, event, handler) {
    if (!(object && event && handler))
        return;

    var events = object[event + 'Events'];
    if (!events)
        return;

    for (var i = 0; i < events.length; i++)
        if (object[event + 'Events'][i] == handler)
            return object[event + 'Events'].splice(i, 1);
}

function _eventHandler(event) {
    if (!event) event = window.event;

    var events = this['on' + event.type + 'Events'];
    if (!events)
        return;

    for (var i = 0; i < events.length; i++) {
        this.eventMethod = events[i];
        if (this.eventMethod(event) == false) {
            this.eventMethod = null;
            return false;
        }
        this.eventMethod = null;
    }
}