.btop{z-index:10000;position:fixed;left:0;bottom:50px;width:34%;margin-left:50%;opacity:.5;filter:alpha(opacity=50)}.btop:hover{opacity:1;filter:alpha(opacity=100);cursor:pointer}.btop-but{z-index:10000;position:absolute;display:block;left:40px;bottom:0;margin:0 0 0 100%;padding:25px 18px 5px;color:#fff;background:#a10 url(btop.png) no-repeat 50% 11px;border-radius:7px}