.adcol1 {
   position: absolute; top:40px;left: 40px;
   height:600px;
   width: 120px;
   z-index: 0;
}

.adcol2 {
   position: absolute; top:40px;right: 40px;
   height:600px;
   width: 120px;
   z-index: 0;
}

#forum {
    position: relative;
    z-index: 1;
}

#photos {
    position: relative;
    z-index: 1;
}