/* CSS Document */
body{ padding:0; margin:0 auto; width:100%; background:url(../images/bj.gif) repeat-x;  }
.clear{ clear:both;}
.top,.top1{  width:916px; margin:0 auto;}
.top{ height:430px;}
.top1{ height:150px;}
.logo{ height:111px; background:url(../images/logo.gif) no-repeat; }
.nav{ width:916px; height:33px; }
.main{width:956px; margin:0 auto;}
.tu{ padding-left:50px;}
.tu td{ padding:5px 10px;}
.nav ul{margin:0;padding:0;list-style:none;height:33px;text-align:center;font-family:Arial;}
	.nav ul li{float:left;position:relative;height:33px;}
		.nav ul li a{display:block;height:33px;line-height:33px;color:#fff;}
			.nav ul li a span{position:absolute;left:0px;top:0px;height:33px;background-image: url(../images/navxin.gif);width:100%;line-height:999px;overflow:hidden;cursor:pointer;padding-right:40px;}	
		.nav ul li a:hover{color:#75B4E7;}
		.nav ul li#bi_home a{width:90px;}
			.nav ul li#bi_home a span{background-position:left top;}
			.nav ul li#bi_home a:hover span{background-position:left -33px;}
 		.nav ul li#bi_bbs a{width:87px;}
			.nav ul li#bi_bbs a span{background-position:-90px top;}
			.nav ul li#bi_bbs a:hover span{background-position:-90px -33px;}
 		.nav ul li#bi_think a{width:87px;}
			.nav ul li#bi_think a span{background-position:-177px top;}
			.nav ul li#bi_think a:hover span{background-position:-177px -33px;}
 		.nav ul li#bi_wiki a{width:87px;}
			.nav ul li#bi_wiki a span{background-position:-261px top;}
			.nav ul li#bi_wiki a:hover span{background-position:-261px -33px;}
 		.nav ul li#bi_desktop a{width:87px;}
			.nav ul li#bi_desktop a span{background-position:-348px top;}
			.nav ul li#bi_desktop a:hover span{background-position:-348px -33px;}
 		.nav ul li#bi_rss a{width:87px;}
			.nav ul li#bi_rss a span{background-position:-438px top;}
			.nav ul li#bi_rss a:hover span{background-position:-438px -33px;}
		.nav ul li#bi_zx a{width:87px;}
			.nav ul li#bi_zx a span{background-position:-525px top;}
			.nav ul li#bi_zx a:hover span{background-position:-525px -33px;}
		.nav ul li#bi_jm a{width:87px;}
			.nav ul li#bi_jm a span{background-position:-614px top;}
			.nav ul li#bi_jm a:hover span{background-position:-614px -33px;}
		.nav ul li#bi_zp a{width:87px;}
			.nav ul li#bi_zp a span{background-position:-699px top;}
			.nav ul li#bi_zp a:hover span{background-position:-699px -33px;}
		.nav ul li#bi_lx a{width:87px;}
			.nav ul li#bi_lx a span{background-position:-786px top;}
			.nav ul li#bi_lx a:hover span{background-position:-786px -33px;}
.bottom{ width:100%; height:70px; background:url(../images/bot.gif) repeat-x; text-align:center; line-height:22px; margin:10px 0;}