#image_gallery {
position: absolute;
top: 90px;
width: 370px;
margin-right: -1em;
}
ul#gallery_thumbs {
list-style: none;
margin-top: 2em;
margin-left: 0;
padding: 0;
}
#gallery_thumbs li {
background: none;
display: inline;
}
.thumb img { /* styles thumbnail previews */
background: #000;
border: 0;
margin-right: 2em;
margin-bottom: 1em;
}
.thumb a:active img, .thumb a:focus img {
background-color: transparent;
}
.thumb span { /* hides large previews */
visibility: hidden;
display: block;
position: absolute;
height: 448px;
}
.thumb span img { /* styles large previews */
position: absolute;
background: #fff;
display: block;
border: 0;
height: 448px;
clear: both;
}
.thumb:active span, .thumb:focus span, .thumb a:active span, .thumb a:focus span { /* displays preview while hovering over thumb */
visibility: visible;
top: 0; /* absolute positioning to control where previews are displayed */
left: 16px;
height: 448px;
margin-left: 354px;
z-index: 100;
}
.thumb span div.caption {
position: absolute;
top: 460px;
width: 800px;
font-size: .8em;
}

.webkit .thumb:hover span {
visibility: visible;
top: 0; /* absolute positioning to control where previews are displayed */
left: 16px;
height: 448px;
margin-top: 1px;
margin-left: 354px;
z-index: 1000;
}

.webkit #image_gallery li a{
display: inline-block;
width: 190px;
margin-right: -10px;
}