.ad_tl {
background: url(http://www1.picfront.org/picture/hi0fXhmkbv/img/bn.png) no-repeat 0 0;
width: 462px;
height: 95px;
}

.ad_tl_groß {
background:url(ad.gif) no-repeat 0 0;
width:120px;
height:600px;
}