.btop { border-top: solid 1px #000000 }
.bbottom { border-bottom: solid 1px #000000 }
.bleft { border-left: solid 1px #000000 }
.bright { border-right: solid 1px #000000 }
.wtop { border-top: solid 1px #ffffff }
.wbottom { border-bottom: solid 1px #ffffff }
.wleft { border-left: solid 1px #ffffff }
.wright { border-right: solid 1px #ffffff }