[Moo] Trying to port Roar Notifications to 1.3

[Dailce]

Hi, I really like this notification class, and I've been trying to
port it over to mootools 1.3 (no compatibility).

here is the link:  http://jsfiddle.net/PCn4W/1/
Credit goes to Harald Kirschne

However, I seem to be getting an error in the following block of code:

this.items.push(item.addEvent('click', remove));
        if (this.options.duration) {
            var over = false;
            var trigger = (function() {
                trigger = null;
                if (!over) remove();
            }).delay(this.options.duration);
            item.addEvents({
                mouseover: function() {
                    over = true;
                },
                mouseout: function() {
                    over = false;
                    if (!trigger) remove();
                }
            });
        }

If I change this.items.push(item.addEvent('click', remove));
TO:  this.items.push(item.addEvent('click', function()
{this.remove()}));

Then the notifications fire, however, the trigger function doesn't
work.
Firebug says something like remove is not a function.

What am I missing?