center text below thumbnail

[cway]

1) Script Title: CSS Image Gallery

2) Script URL (on DD): http://www.dynamicdrive.com/style/cs...image-gallery/

3) Describe problem: I can't seem to get the text below each thumbnail, centered. Does anybody have any ideas?

http://dev.shadowboxart.com/page/CTGY/earrings

/* Begin DynamicDrive Gallery
--------------------------------------------------------------------------------- */
/*Credits: Dynamic Drive CSS Library */
/*URL: http://www.dynamicdrive.com/style/ */

.navigation_container
{
	/*position: relative;*/
	/*Add a height attribute and set to largest image's height to prevent overlaying*/
	height: 20px;
	margin:0 auto;
	text-align:center;
	top: 0px;
	border:0px solid #0f0;
	font-weight:bold;
}
.navigation_container a{width:16px;height:20px;line-height:20px;text-decoration:none;color:#666;}
.navigation_container td{height:20px;line-height:20px;font-size:10px;color:#f00;}
.pageActive{
	display:block;
	width:16px;
	height:20px;
	background-image:url('graphics/yellow_dot.gif');
	background-repeat:no-repeat;
	background-position:center;
	}

.product_description
{
	position: relative;
	/*Add a height attribute and set to largest image's height to prevent overlaying*/
	height: 0px;
	width: 450px;
	left: -10px;
	text-align: left;
	top: 476px;
	font-size: 0.8em;
	line-height: 1.5em;
	font-family: Arial, Helvetica, sans-serif;
}

.gallerycontainer
{
	position: relative;
	/*Add a height attribute and set to largest image's height to prevent overlaying*/
	/*height: 0px;*/
	height:auto;
	width: 380px;
	left: 470px;
	text-align: center;
	top: -20px;
	border:0px solid #0f0;
}

.gallerycontainer h1
{
	text-align: left;
	font-size: 9pt;
	font-family: Arial, Helvetica, Geneva, Swiss, SunSans-Regular;
	text-decoration: none;
	line-height: 0pt;
	color: #900;
	margin-top: 30px;
	font-weight: bold;
	margin-left: 0px;
}

.thumbnail img { margin: 0 2px 0px 0; }

.thumbnail:hover{
background-color: transparent;
}

.thumbnail:hover img { }

.thumbnail span
{
	/*CSS for enlarged image*/
	position: absolute;
	padding: 2px;
	left: -500px;
	visibility: hidden;
	color: black;
	text-decoration: none;
}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 0px;
}

.thumbnail:hover span
{
	/*CSS for enlarged image*/
	visibility: visible;
	top: 144px;
	left: -388px;
	/*position where enlarged image should offset horizontally */
	z-index: 50;
}

dl
{
	text-align: center;
	font-size: .95em;
	margin-top: 25px;
}
dt,dd {
	width:4.5em;
	float:left;
}
dt
{
	width: 110px;
	text-align: center;
	margin: 0em .5em 1.6em 0em;
}
dd
{
	margin: 57px 0 0 -7.5em;
	text-align: center;
	font-size: 8pt;
	font-family: Arial, Helvetica, Geneva, Swiss, SunSans-Regular;
	text-decoration: none;
	line-height: 10pt;
	white-space: nowrap;
}
img.tn
{
	vertical-align: bottom;
	padding: 2px;
	border: 0em;
	text-align: center;
}
em
{
	display: block;
	font-weight: bold;
	margin-bottom: 5px;
}
dl a:hover img,dl a:active img,dl a:focus img
{
}

[cway]

HTML:

<dd>
     <img src=".." />
     <a href="" >  </a>
</dd>

CSS:

dd a {
    text-align: center;
    display: block;
}
dd img {
    display: block;
    margin: 0 auto;
}