<style type="text/css">
.bl {background: url(../images/rat/bl.gif) 0 100% no-repeat /*#CCFFFF*/; width: 100%}
.br {background: url(../images/rat/br.gif) 100% 100% no-repeat; padding:10px}
.tl {background: url(../images/rat/tl.gif) 0 0 no-repeat}
.tr {background: url(../images/rat/tr.gif) 100% 0 no-repeat; padding:10px}
.clear {font-size: 1px; height: 1px}
</style>