怎么修改这段代码让导航居中》?

.navMenu{background:url(mainNav_bg.gif);width:960px;height:30px;line-height:30px;border-bottom:1px solid #CFCFCF;clear:both}.navMenu ul{float:left}.navMenu li{ display: inline;font-size:14px;letter-spacing: 1px;}.navMenu li a{float: left;color: #CFCFCF;padding: 3px 15px 0 15px;height:30px;text-decoration: none;border-right: 1px solid #CFCFCF;font-weight:bold;}.navMenu li a:hover,.navMenu li.hover a{color: #000;background: #EAEAEA;} 收起