#practice {
      margin:0; padding:0;
      position:relative;
      width:800px; height:148px;
      overflow:hidden;
      }
#practice span {
      display:block;
      position:absolute; left:0; top:0; z-index:1;
      width:800px; height:148px;
      margin:0; padding:0;
      background:url("../graphics/practiceheader.gif") top left no-repeat;
      }