.ad {
	margin: 0 auto;
	padding: 0 0 10px 0;
}

.ad._970x66,
.ad._970x90,
.ad._970x250,
.ad._970x {
	width: 970px;
}
.ad._300x250,
.ad._300x {
	width: 300px;
}

.ad._970x {
	padding: 0;
}