#header .ban{float:left;width:50px;height:50px;margin-top:20px;filter:alpha(opacity=50);-moz-opacity:0.5;-khtml-opacity:0.5;opacity:0.5;}
#header #demo{overflow:hidden;height:50px;line-height:50px;width:1000px;color:#da9e6f;white-space:nowrap;float:left;margin-top:10px;font-size:24px;margin-left:150px;}
.an_buut{position:fixed;width:235px;height:235px;background:url(../images/logo.png) no-repeat;z-index:10;left:50%;margin-left:-800px;z-index:100000;margin-top:-20px}
.an_buut img{margin-left:30px;margin-top:10px;}

#bg{width:1920px;height:900px;position:absolute;left:50%;margin:0px auto -272px -960px;z-index:-1}