document.observe('lightview:opened', function(event) {
      if(event.target.href.match('images/samples/cd1.png') != null) {
         setTimeout("Lightview.startSlideshow();", 3000); //3 seconds delay
      }
   }
);

document.observe('lightview:opened', function(event) {
      if(event.target.href.match('images/samples/dvd1.png') != null) {
         setTimeout("Lightview.startSlideshow();", 3000); //3 seconds delay
      }
   }
);