You have an error in your lightbox css file, and it appears as though the next and previous images are missing. Start over with a fresh copy of lightbox.css from the distribution archive, and make sure that the next and previous images are available to your page.
Now, it looks as though you are trying to make lightbox only do next, and to do it without the next and previous buttons. In that case, you might try this change to your existing lightbox css file (addition red):
Code:
#prevLink {width:1px; left: 0; float: left;}
width:0; might be even better, but might not work in some browsers.
But that will make the next button visible, at least it did in FF. So, if you do want to get rid of the button, you can remove it from the css as well (delete both these lines):
Code:
#prevLink:hover, #prevLink:visited:hover { background: url(../lightbox2.03a/images/prevlabel.gif) left 15% no-repeat; }
#nextLink:hover, #nextLink:visited:hover { background: url(../lightbox2.03a/images/nextlabel.gif) right 15% no-repeat; }
as you obviously don't need the previous button either.
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