.tl_tre { background: url("../images/round_colors/tre_01.gif") no-repeat left top; }
.tr_tre { background: url("../images/round_colors/tre_02.gif") no-repeat right top; }
.bl_tre { background: url("../images/round_colors/tre_03.gif") no-repeat left bottom; }
.br_tre { background: url("../images/round_colors/tre_04.gif") no-repeat right bottom; }

.sub_tre, .full_tre { background-color: #246049; }