Посмотрел, меняется у дивов display:block; на display:none; и все
Вот css:
.wpposttab{width:100%;margin:10px 0;}
.wpposttab .wstab{position:relative;margin:0 0 0 10px;padding:0;z-index:22;}
.wpposttab .wstab li{position:relative;float:left;border:1px solid #d2d3d5;background:#f1f1f2;margin:0 5px 0 0;padding:5px 10px;text-align:center;text-transform:uppercase;font-weight:bold;color:#3c3b3d;list-style:none;}
.wpposttab .wstab li:hover{color:#f68b2e;cursor:pointer;}
.wstabl,.wstabr{position:absolute;top:-1px;width:6px;height:6px;overflow:hidden;font-size:0;background:url(images/round.png) no-repeat;}
.wstabl{left:-1px;background-position: 0 0;} .wstabr{right:-1px;background-position: -6px 0;}
.wstabcn{display:none;position:relative;border:1px solid #d2d3d5;background:#FFF;z-index:10;top:-1px;padding:10px 10px;overflow:hidden;}
.wstbshow{display: block;}
.wpposttab li.wstbcur{color:#f68b2e;border-bottom:1px solid #FFF; background:#FFF;}
.wpposttab li.wstbcur:hover{color:#f68b2e;cursor:auto;}