gistfile1.js

YUI().use('node', function(Y){
    
    Y.one('#foo').on('click', function(e){
        // Lazy-use OverlayModal.
        // Create and show a new modal Overlay.
        Y.use('gallery-overlay-modal', function(){
            var myModalOverlay = new Y.Overlay({
                bodyContent : '<p>I am modal!</p>',
                width       : '300px',
                height      : '150px',
                zIndex      : 100,
                render      : true,
                plugins     : [{ fn: Y.Plugin.OverlayModal }]
            });
        });
    });
    
    Y.one('#bar').on('click', function(e){
        // Lazy-use OverlayExtras.
        // Create and show a new modal Overlay with autohide.
        Y.use('gallery-overlay-extras', function(){
            var myModalAutohidingOverlay = new Y.Overlay({
                bodyContent : '<p>I am modal and autohide!</p>',
                width       : '300px',
                height      : '150px',
                zIndex      : 100,
                render      : true,
                plugins     : [
                    
                    { fn: Y.Plugin.OverlayModal },
                    { fn: Y.Plugin.OverlayAutohide }
                    
                ]
            });
        });
    });
    
});