JS Deferred Hover

var TimeoutHover = function(items, activeClass, deferTime)
{
    var _deferTime = deferTime || 200;
    var _deferTimer = null;
    var _activeClass = activeClass || 'active';

    if (!items) {
        throw new Error("Argument 'items' is empty");
    }

    var $items = $(items);

    function menuItemMouseEnter(e) {
        if (_deferTimer) clearTimeout(_deferTimer);
        _deferTimer = setTimeout(menuItemActivate, _deferTime, e.currentTarget);
    }

    function menuItemActivate(target) {
        var $target = $(target);
        if (!$target.is('.'+_activeClass)) $items.removeClass(_activeClass);
        $target.addClass(_activeClass);
    }

    function menuItemMouseLeave(e) {
        if (_deferTimer) clearTimeout(_deferTimer);
        _deferTimer = setTimeout(menuItemDeactivate, _deferTime);
    }

    function menuItemDeactivate() {
        $items.removeClass(_activeClass);
    }

    function attachEvents() {
        $items.hover(menuItemMouseEnter, menuItemMouseLeave);
    }

    attachEvents();
};