.t {background: url(border-top.png) 0 0 repeat-x;}
.b {background: url(border-bottom.png) 0 100% repeat-x}
.l {background: url(border-left.png) 0 0 repeat-y}
.r {background: url(border-right.png) 100% 0 repeat-y}
.bl {background: url(corner-bottom-left.png) 0 100% no-repeat}
.br {background: url(corner-bottom-right.png) 100% 100% no-repeat}
.tl {background: url(corner-top-left.png) 0 0 no-repeat}
.tr {background: url(corner-top-right.png) 100% 0 no-repeat; padding:20px}