What cover? If I click on:

a lightbox opens. If I click on either of the two other similar but smaller images, a page loads. But as far as I can tell, that's what's supposed to happen. Those links have no lightbox syntax.
However, after playing with it a bit more, I see that if I click on one of the links to the left, and THEN click on the cover, it loads in a new page, not a lightbox.
Here's what I would try, in the Dynamic Ajax Content script replace:
Code:
function loadpage(page_request, containerid){
if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))
document.getElementById(containerid).innerHTML=page_request.responseText
}
with:
Code:
function loadpage(page_request, containerid){
if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
document.getElementById(containerid).innerHTML=page_request.responseText;
if (typeof myLightbox.updateElementList === 'function'){
myLightbox.updateElementList();
}
}
}
Bookmarks