.bl {background: url(/images/bl.png) 0 100% no-repeat}
.br {background: url(/images/br.png) 100% 100% no-repeat}
.tl {background: url(/images/tl.png) 0 0 no-repeat}
.tr {background: url(/images/tr.png) 100% 0 no-repeat}
.clear {font-size: 1px; height: 1px}