gistfile1.js

YUI.add('flash-messages', function(Y) {

    Y.namespace('mitch');

    //@object payload: config options for overlay 
    Y.Global.on('flash:message', function(payload) {
        var overlay = new Y.Overlay(payload);

        overlay.get('boundingBox').addClass('flash');

        overlay.render("body").show();

        Y.later(2000, overlay, function() {
            this.get('contentBox').hide('fadeOut', {}, function() {
                overlay.destroy();
            });
        });        
    });
}, '0.1', { 
    requires: ['base', 'event-custom', 'overlay'] 
});