*{ margin:0; padding:0; list-style:none}
.weixin{ width:40px; height:40px; margin:0 auto; position:relative; font-size:12px; text-align:center;}
.weixin a{width:40px; height:40px; display:block; position:absolute; left:0; top:0;background:url(../images/weixin.png) no-repeat center top; }
.weixin .weixin_nr{width:120px; height:140px; padding:10px; background:#EDEDED; text-align:center; position:absolute; left:-40px; top:55px; display:none;}
.weixin .weixin_nr img{ margin-bottom:5px;}
.weixin .weixin_nr .arrow2{ width:0; height:0; border-bottom:10px solid #EDEDED;border-left:10px solid transparent;border-right:10px solid transparent; position:absolute; left:50px; top:-10px;}
.weixin.on .weixin_nr{ display:block;}
.weixin.on a{ background:url(../images/weixin.png) no-repeat left bottom; }