.bl {background: url(../images/bl.gif) 0 100% no-repeat}
.br {background: url(../images/br.gif) 100% 100% no-repeat}
.tl {background: url(../images/tl.gif) 0 0 no-repeat}
.tr {background: url(../images/tr.gif) 100% 0 no-repeat; padding: 10px}

.clear {font-size: 0px; height: 0px}