Purtroppo ho controllato i collegamenti e mi sembrano corretti di seguito metto anche il foglio css ma non capisco proprio cosa non funziona.

#lightbox{
position: absolute;
left: 0;
width: 100%;
z-index: 100;
text-align: center;
line-height: 0;
}

#lightbox a img{ border: none; }

#outerImageContainer{
position: relative;
background-color: #fff;
width: 250px;
height: 250px;
margin: 0 auto;
}

#imageContainer{
padding: 10px;
}

#loading{
position: absolute;
top: 40%;
left: 0%;
height: 25%;
width: 100%;
text-align: center;
line-height: 0;
}
#hoverNav{
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
z-index: 10;
}
#imageContainer>#hoverNav{ left: 0;}
#hoverNav a{ outline: none;}

#prevLink, #nextLink{
width: 49%;
height: 100%;
background: transparent url(../images/blank.gif) no-repeat; /* Trick IE into showing hover */
display: block;
}
#prevLink { left: 0; float: left;}
#nextLink { right: 0; float: right;}
#prevLink:hover, #prevLink:visited:hover { background: url(../images/prevlabel.gif) left 15% no-repeat; }
#nextLink:hover, #nextLink:visited:hover { background: url(../images/nextlabel.gif) right 15% no-repeat; }

#imageDataContainer{
font: 10px Verdana, Helvetica, sans-serif;
background-color: #fff;
margin: 0 auto;
line-height: 1.4em;
overflow: auto;
width: 100%
}

#imageData{ padding:0 10px; color: #666; }
#imageData #imageDetails{ width: 70%; float: left; text-align: left; }
#imageData #caption{ font-weight: bold; }
#imageData #numberDisplay{ display: block; clear: left; padding-bottom: 1.0em; }
#imageData #bottomNavClose{ width: 66px; float: right; padding-bottom: 0.7em; }

#lightbox img{ border: none; clear: both;}
#overlay img{ border: none; }

#overlay{
position: absolute;
top: 0;
left: 0;
z-index: 90;
width: 100%;
height: 500px;
background-color: #000;
background-image: url(overlay.png);
}

* html #overlay{
background-color: #000;
back\ground-color: transparent;
background-image: url(blank.gif);
filter: progidXImageTransform.Microsoft.AlphaImageLoader(src="ov erlay.png" , sizingMethod="scale");
}