Javascript aide

Bonjour, je suis débutant en javascript mais j'aimerais faire quelque chose d'assez compliquer : créer un diaporama tout comme il faut mais par moi même. Et pour cela j'aimerais que l'on m'explique ce que fait cette ligne de code que j'ai trouver dans un slideshow téléchargeable
j'y ai passer 2 heures sans succès alors pour les plus courageux :

pardonnez moi cette présentation mais je l'ai trouver tel quel

d'avance merci

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