我试过了,这个办法行,谢谢你!

/* 导航栏 */
.navline {
 background: #FFFFFF;
 font: 0px/0px sans-serif;
 height: 1px;
 clear: both;
}
.navup, .navdown {
 width: 772px;
 background: #FFFFFF;
 text-align: center;
 height: 22px;
}
#nav-up-center {
 border-left: #FFFFFF 1px solid;
 border-right: #FFFFFF 1px solid;
 float: left;
 padding: 4px 2px 4px 2px;
 width: 172px;
 background: #7EC0EE;
 text-align: center;
}
#nav-up-left {
 float: left;
 padding: 4px 2px 4px 2px;
 width: 772px;
 background: #26BEF2;
 text-align: center;
}
#nav-up-right {
 float: right;
 padding: 4px 2px 4px 2px;
 width: 156px;
 background: #E0E9FE repeat;
 text-align: center;
}
#nav-down-center {
 border-left: #FFFFFF 1px solid;
 border-right: #FFFFFF 1px solid;
 float: left;
 padding: 4px 2px 4px 2px;
 width: 172px;
 background: #87CEFF;
 text-align: center;
}
#nav-down-left {
 float: left;
 padding: 4px 2px 4px 2px;
 width: 430px;
 background: #63B8FF;
 text-align: center;
}
#nav-down-right {
 float: right;
 padding: 4px 2px 4px 2px;
 width: 156px;
 background: #EAF2FF repeat;
 text-align: center;
}
a.grey:link,a.grey:visited {
 color: #5C5C5C;
 font-size: 12px;
 font-weight: bold;
 text-decoration: none;
}
a.grey:active,a.grey:hover {
 color: #333333;
 font-size: 12px;
 font-weight: bold;
 text-decoration: none;
}
a.white:link,a.white:visited {
 color: #FFFFFF;
 font-size: 12px;
 font-weight: bold;
 text-decoration: none;
}
a.white:active,a.white:hover {
 color: #DDDDDD;
 font-size: 12px;
 font-weight: bold;
 text-decoration: none;
}
/* 底部菜单 */
#footer {
 width: 772px;
 border: 3px solid #FFFFFF;
 margin: 0 auto;
 text-align: center;
}
#bottommenu{
 width: 754px;
 padding: 9px;
 margin: 0 auto;
 background: #EEEEEE;
}
#bottom{
 width: 762px;
 padding: 5px;
 margin: 0 auto;
 background: #F6F6F6;
 line-height: 180%;
 height: 60px;
}
#bottom span {
 font: 11px arial,helvetica,sans-serif;
}