.sitewidth
{
	width:960px;
}
.mt20
{
	margin-top:20px;
}
.mt10
{
	margin-top:10px;
}
#ad300x250
{
	width:300px;
	height:250px;
}
#ad468x15
{
	width:468px;
	height:15px;
	margin:20px auto;

}
.ad120x90
{
	width:150px;
	height:90px;
	float:left;
}