div 以及其內部的img垂直居中

css

.photo {
	position: absolute;
	top: 50%;
	margin-top: -400px;
	width: 100%; 
	height: 600px; 
	line-height: 600px; 
	text-align: center; 
}

.photo img {
	vertical-align: middle;
	position: static;
	top: -50%;
	left: -50%;
}

Html

<div class="photo">
	<img src="http://farm9.staticflickr.com/8247/8636688005_2d7609f253.jpg"/>
</div>