// JavaScript Document
 
  var nav = document.getElementById("navi");
  var links = nav.getElementsByTagName("li");
  var lilen = nav.getElementsByTagName("a"); //判断地址
  var currenturl = document.location.href;
  var first = 0;
  for (var i=0;i<links.length;i++)
  {
      var linkurl = lilen[i].getAttribute("href");
          if(currenturl.indexOf(linkurl)!=-1)
              {
              first = i;
              }
  }
  links[first].className = "navon"; //高亮代码样式