/*»ù±¾Ñùʽ*/ 
div, ul, li, span, a{ 
 margin: 0; 
 padding: 0; 
 border: 0; 
} 
div, ul, li, span{ 
 list-style:none; 
} 

#content{ 
 width:810px; margin-right: auto; margin-left: auto;
} 
#header{ 
} 
#header ul, 
#header ul li{ 
 display:inline; 
margin-right: auto; margin-left: auto;
} 
.nav_main{  
 margin-bottom:5px; 
 width:100%; 
 text-align:center; 
} 
.nav_main ul li{ 
 float: left; 
} 
.nav_current{ 
 font-weight: bold; 
color:#ffffff;
 background-image:url(http://www.cniplc.com/menu/menu_b.gif); 
 display: block; 
 float: left; 
 font-size: 14px; 
 height: 30px; 
 padding-top: 9px; 
 text-decoration: none; 
 width: 73px; 
}

.nav_link{ 
font-family:Arail;
color:#ffffff;
 font-weight: bold; 
 background-image:url(http://www.cniplc.com/menu/menu_r.gif); 
 display: block; 
 float: left; 
 font-size: 14px; 
 
 height: 30px; 
 padding-top: 9px; 
 text-decoration: none; 
 width: 73px; 
} 
.sub_box_de{ 
 float:left; 
} 
.sub_box{ 
 float:left; 
 display:none; 
} 
#footer{ 
 margin-top:66px; 
 text-align:center; 
}