#demo2 {
	margin: 0; padding: 5px;
	float: left;
	position: relative;
	width: 277px;
	height: 210px;
}
#demo2 img {
	width: 267px; height: 200px;
	border: 1px solid #ddd;
	padding: 5px;
	background: #f0f0f0;
	position: absolute;
	left: 0; top: 0;
	-ms-interpolation-mode: bicubic; 
}
#demo2 img.hover {
	margin-top:15px;
	background:url(/test/img/thumb_bg.png) no-repeat center center;
	border: none;
}