body{
	background-image: url(images/home_bg.jpg);
	background-repeat: no-repeat;
	background-position: center -200px;
	;
}
.div_table-cell{
	width:100%;
	height:100%;
	display:table-cell;
	text-align:center;
	vertical-align:middle;
	}
 
/* IE6 hack */
.div_table-cell span{
	height:5%;
	display:inline-block;
	}
 
/* 讓table-cell下的所有元素都居中 */
.div_table-cell *{ vertical-align:middle;}