#main_a{background:#FFF url(../images/main120111/main_xueqi_01.jpg) no-repeat center top;}
#main_b{background:url(../images/main120111/main_xueqi_02.jpg) no-repeat center 202px;}
#main_c{background:url(../images/main120111/main_xueqi_03.jpg) no-repeat center 317px;}
#main_d{background:url(../images/main120111/main_xueqi_04.jpg) no-repeat center 544px;}

/* header */
#header{height:423px;}
.main_nav{width:960px; height:40px; position:absolute; left:28px; top:0px;}
.main_nav,.main_nav a:hover{background:url(../images/main120111/main_navb.jpg) no-repeat 0 0;}
.main_nav a{display:inline; float:left; width:104px; height:58px; margin-right:1px; overflow:hidden; text-indent:-9999px;}
.main_nav a.n1:hover{background-position:0 -40px;}
.main_nav a.n2:hover{background-position:-105px -40px;}
.main_nav a.n3:hover{background-position:-210px -40px;}
.main_nav a.n4:hover{background-position:-315px -40px;}
.main_nav a.n5:hover{background-position:-420px -40px;}
.main_nav a.n6:hover{background-position:-525px -40px;}
.main_nav a.n7:hover{background-position:-630px -40px;} 
.main_nav a.n8:hover{background-position:-735px -40px;}
.main_nav a.n9:hover{background-position:-840px -40px;}

.main_top_btn{width:312px;height:134px;position:absolute;top:94px;left:306px;}

.linkout{position:absolute;top:80px;left:140px;width:428px;height:224px;}