.t {background: url(t.png) 0 0 repeat-x}
.b {background: url(b.png) 0 100% repeat-x}
.l {background: url(l.png) 0 0 repeat-y}
.r {background: url(r.png) 100% 0 repeat-y}
.bl {background: url(bl.png) 0 100% no-repeat}
.br {background: url(br.png) 100% 100% no-repeat}
.tl {background: url(tl.png) 0 0 no-repeat}
.tr {background: url(tr.png) 100% 0 no-repeat; padding:10px}
.ar {background: url(a.png) 42% 100% no-repeat}