.banner_ad_top
{
    width: 435px;
    margin-left: 6px;
    margin-top: 2px;
    margin-bottom: 5px;
    float: none;
    clear: both;
    overflow: hidden;
}

.banner_ad_bottom
{
    width: 435px;
    margin-left: 42px;
    margin-top: 10px;
    margin-bottom: 7px;
    float: none;
    clear: both;
    overflow: hidden;
}