.img_big_tl{background:url(/img/site/img/tl.png) no-repeat top left;width:10px;height:10px;}
.img_big_tr{background:url(/img/site/img/tr.png) no-repeat top right;width:10px;height:10px;}
.img_big_bl{background:url(/img/site/img/bl.png) no-repeat bottom left;width:10px;height:10px;}
.img_big_br{background:url(/img/site/img/br.png) no-repeat bottom right;width:10px;height:10px;}

.img_small_tl{background:url(/img/site/img/s_tl.png) no-repeat top left;width:5px}
.img_small_tr{background:url(/img/site/img/s_tr.png) no-repeat top right;}
.img_small_bl{background:url(/img/site/img/s_bl.png) no-repeat bottom left;width:5px;height:5px;}
.img_small_br{background:url(/img/site/img/s_br.png) no-repeat bottom right;width:5px;height:5px;}