ul#maingallerylist {
   list-style-type: none;
   width: 41em;
}

ul#maingallerylist li ul {
   position: absolute;
   display: none;
   padding: 1px;
}

ul#maingallerylist li:hover ul {
   position: absolute;
   display: inline;
   left: 41em;
   padding: 15px;
}

ul#maingallerylist li ul.gallerylist {
   list-style-type: none;
}