.nav

{

height: 40px;

}

.nav_left

{

width: 10px;

background: url(./img/nav_left.jpg)no-repeat;

}

.nav_mid

{

width: 980px;

background: url(./img/nav_bg.jpg)repeat-x;

}

.nav_right

{

width: 10px;

background: url(./img/nav_right.jpg)no-repeat;

}

.nav_left,.nav_mid,.nav_right

{

float: left;

height: 40px;

}

.nav_mid_left,.nav_mid_right

{

float: left;

}

.nav_mid_left

{

width: 680px;

}

.nav_mid_right

{

width: 300px;

}

.nav_mid_left li

{

float: left;

list-style-type: none;

width: 100px;

text-align: center;

}

.nav_mid_left a:link,.nav_mid_left a:visited

{

text-decoration: none;

color: #ffffff;

font-size: 16px;

font-family: "微软雅黑";

}

.nav_mid_left a:hover,.nav_mid_left a:active

{

text-decoration: none;

color: #ffff7f;

font-size: 16px;

font-family: "微软雅黑";

}

.search_text

{

width: 190px;

height: 25px;

margin-top: 5px;

background: url(img/search.jpg) no-repeat right center;

background-color: #FFFFFF;

padding-right: 25px;

border: 1px solid #FFFFFF;

}

.ad

{

width: 100%;

height: 320px;

overflow: hidden;

position: relative;

}