startList = function() {
      if (document.all&&document.getElementById) {
            LI = document.getElementById("nav_body").getElementsByTagName('li');
            for (i=0; i < LI.length; i++) {
                        LI[i].onmouseover=function() {
                              this.className+=" act";
                        }
                        LI[i].onmouseout=function() {
                              this.className=this.className.replace(" act", "");
                        }
            }
      }
}