#shangxia{position:fixed;bottom:20px;right:50px;display:block;margin-right:0; z-index:999; }
#shang,#comt,#xia{background:url(../images/huadong.png) no-repeat;position:relative;cursor:pointer;height:50px;width:50px;}
#comt{background-position:left -30px;height:32px;}
#xia{background-position:left -68px;}
#comt:hover{background-position:right -30px;}
 
#myrss {background:url(../images/rss.png) no-repeat;height:128px;width:128px;margin:50px 0 0 -50px;position:relative;cursor:pointer;}
 @media screen and (max-width:560px){#shangxia{ display:none}}