.td,span{ font-size:12px}
#exNav3{
   border: 1px solid black;
   width: 205px;
 }
#exNav3 ul{
   margin: 0;
   padding: 0;
   width:100%;
   list-style-type: none;
   font: normal 90% 'Trebuchet MS', 'Lucida Grande', Arial, sans-serif;
   }
#exNav3 ul li{
   display:block;
   font-size:14px;
   font-weight:bold;
   margin:0;
   padding:0;
   }
#exNav3 li a{
   margin:0;
   padding:0;
   display: block;
   height:40px;
   line-height:40px;
   padding-left:1em;
   text-decoration: none;
   color: white;
   background-color: #2175bc;/*hover的时候改变*/
   border-bottom: 1px solid #90bade;
   border-left: 7px solid #1958b7;/*hover的时候改变*/
   }
#exNav3 li a:hover {
   background-color: #2586d7;/*hover的时候改变*/
   border-left-color: #1c64d1;/*hover的时候改变*/
   }
#exNav3 h2.menutitle{
   width:100%;
   margin:0;
   padding:0;
   text-indent:1em;
   color: white;
   border-bottom: 1px solid black;
   background-color: black;
   font: bold 100% 'Trebuchet MS', 'Lucida Grande', Arial, sans-serif;
   }
   
#abtleft{float:left; width:207px; margin:0px 0px 5px 5px;}
#abtright{float:left;margin:0px 0px 5px 0px;width:780px;}
.abttit{ background-image:url(../images/about_01.gif); width:780px; height:34px; line-height:34px; padding-left:25px; font-weight:bold}
#abtmid{ background-image:url(../images/about_02.gif); width:780px; height:350px; padding:5px 20px 5px 20px; font-size:12pxpx; color:#1F2A6F}