div.center{margin-left:auto;margin-right:auto;width:900px;}
div.gao{font-size:0px;}
div.center1{margin-left:auto;margin-right:auto}
a.a1{color:#000000;text-decoration:none}
a.a1:hover{text-decoration:underline;}

a.a2{text-decoration:none}
a.a2:hover{text-decoration:underline;}