*{ margin:0; padding:0;}
body{ font-size:14px; font-family:Arial, Helvetica, sans-serif; background:url('http://math.ustc.edu.cn/Conference/iam2012/img/bg.png') repeat-x #fff;}

#nav{ width:226px; min-height:550px; height:auto;background:#c3e4f4; float:left; margin-left:0.5px;}
#nav ul{ padding-top:30px;}
#nav ul li{ list-style:none; height:33px; line-height:33px; background:#0076c0; margin:1px 0px;}
#nav ul li a{ display:block; color:#fff; font-family:"黑体"; font-size:17px; text-decoration:none; padding-left:30px;}
#nav ul li a:hover,.hover{ background:url('http://math.ustc.edu.cn/Conference/iam2012/img/nav_hover.png') repeat-x;}