gistfile1.js

// delegate a list item mouseenter event to a list
function mouseenter( event ){                                                        

        $( event.target ).addClass( 'mouseenter' );
}

$('ul').delegate( 'li', 'mouseenter', mouseenter );

// trigger the first list items delegated event 
$('ul').find('li:first').each(function(){

        mouseenter.apply( this.parentNode, [ { target: this } ]);
});