div#term { 
  background: no-repeat url("../../images/login.jpg");
  z-index: 0;
}

div#main {
  background: no-repeat url("../images/cyber.jpg");
  z-index: 2;
}

div.cell {
  background: no-repeat url("../images/map.png");
}

div.cell:hover {
  background: no-repeat url("../images/map_highlight.png");
}