#billboard, #billboard_1, #billboard_2, #billboard_3
{
  position:relative;
  width:200px;
  height:160px;
  overflow:hidden;
  margin:0 auto;
}

#billboard   ul, #billboard   li,
#billboard_1 ul, #billboard_1 li, 
#billboard_2 ul, #billboard_2 li,
#billboard_3 ul, #billboard_3 li
{
  margin:0;
  padding:0;
}

#billboard li, #billboard_1 li, #billboard_2 li, #billboard_3 li
{
  position:absolute;
  width:200px;
  height:160px;
  list-style:none;
}