.tl_bus { background: url("../images/round_colors/bus_01.gif") no-repeat left top; }
.tr_bus { background: url("../images/round_colors/bus_02.gif") no-repeat right top; }
.bl_bus { background: url("../images/round_colors/bus_03.gif") no-repeat left bottom; }
.br_bus { background: url("../images/round_colors/bus_04.gif") no-repeat right bottom; }

.sub_bus, .full_bus { background-color: #532377; }