.user_info { position:relative;z-index:100}
.user_info em{ display:inline-block; }
.user_info em a{ font-weight:bold; padding-right:15px; background:url(../images/icon_header_down.gif) no-repeat right center}
.user_info .on { background:#c00; color:#fff}
.user_info .on em a{  background:url(../images/icon_header_up.gif) no-repeat right center; color:#fff}
.user_info dl{ display:none; position:absolute; left:0; top:35px; padding:0 10px; width:100px; background:#fff; border:1px solid #e3e3e3; box-shadow:0px 3px 3px #999; z-index:100000}
.user_info dd{ line-height:30px; border-bottom:1px dotted #ccc}