<script type="text/javascript">
c_link = function(){
    this.t_attribute = new Array();
    this.judge = function(){
    var t_element = document.getElementById(this.t_attribute[0]).getElementsByTagName("a");
    for (var i=0;i<=t_element.length;i++){
      var t_link = t_element[i].getAttribute("href");
    var c_href = window.location.href;
    if (c_href.indexOf(t_link) != -1){
        o_class = this.t_attribute[1];
      t_class = this.t_attribute[2];
        t_element[i].onmouseover = function (){this.className = o_class;}
      t_element[i].onmouseout = function (){this.className = t_class;}
        t_element[i].className += t_class;      
    }
    }    
  }
}
var aa = new c_link();
aa.t_attribute = ["nav","over_class","c_class"];
aa.judge();
aa = null;

function addloadEvent(func){
  var oldonload = window.onload;
  if (typeof oldonload !='function'){
    window.onload=func;
  }else{
    window.onload=function(){;
  oldonload();
  func();
  }
  }
}
addloadEvent(func);
</script>