Create Onhover Image Caption Using CSS

image-caption.css

/* parent div and hover properties */
.imgteaser {
	margin: 0;
	overflow: hidden;
	float: left;
	position: relative;
}
.imgteaser a {
	text-decoration: none;
	float: left;
}
.imgteaser a:hover {
	cursor: pointer;
}

/* image border */
.imgteaser a img {
	float: left;
	margin: 0;
	border: none;
	padding: 10px;
	background: #fff;
	border: 1px solid #ddd;
}

/* learn more */
.imgteaser a .more {
	position: absolute;
	right: 20px;
	bottom: 20px;
	font-size: 1.2em;
	color: #fff;
	background: #000;
	padding: 5px 10px;
	filter:alpha(opacity=65);
	opacity:.65;
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=65)"; /*--IE 8 Transparency--*/
}
.imgteaser a:hover .desc{
	display: block;
	font-size: 1.2em;
	padding: 10px 0;
	background: #111;
	filter:alpha(opacity=75);
	opacity:.75;
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=75)"; /*--IE 8 Transparency--*/
	color: #fff;
	position: absolute;
	bottom: 11px;
	left: 11px;
	padding: 10px;
	margin: 0;
	width: 566px;
	border-top: 1px solid #999;
}
.imgteaser a:hover .desc strong {
	display: block;
	margin-bottom: 5px;
	font-size:1.5em;
}

/* hide learn more */
.imgteaser a .desc {	display: none; }
.imgteaser a:hover .more { visibility: hidden;}

image-caption.html

<div class="imgteaser">
<a href="#">
	<img src="Daim1.jpg" alt="Daim Graffiti" />
	<span class="more">&raquo; Learn More</span>
	<span class="desc">
		<strong>DAIM 2002</strong>
		Blandit turpis patria euismod at iaceo appellatio, demoveo esse. Tation utrum utrum abigo demoveo immitto aliquam sino aliquip.
	</span>
</a>
</div>

source: http://www.sohtanaka.com/web-design/css-on-hover-image-captions/