.pub728X90 {
	background-color: grey;
	width: 728px;
	height: 90px;
	display: block;
	float: left;
    margin-top: 8px;
}

.pub300X250 {
	background-color: grey;
	width: 300px;
	height: 250px;
	display: block;
    margin-top: 8px;
}

.pub160X600 {
	background-color: grey;
	width: 160px;
	height: 600px;
	display: block;
	float: left;
    margin-top: 8px;
}