.thumb {
	display: inline-block;
	position: relative;
	vertical-align: top;
	margin: 2px;
}
.thumb img {
	background-size: 100%;
}
.thumb em {
	background: url(../../fotoviewer/playbutton.png) no-repeat 0px 0px;
	height: 43px;
	width: 43px;
	top: 9px;         
	left: 19px;
	position: absolute;
	text-indent: -9999px;
	behavior: url(http://voorraad.wheelerdelta.nl/png.htc);
}
.thumb em:hover {
	background-position: -43px 0px;
}