$(document).ready(function(){
  var arVersion = navigator.appVersion.split("MSIE");
  var version = parseFloat(arVersion[1]);

  if (version >= 6.0 && version < 7.0) {
    $("li.menu").hover(
    function() {
      if(this.getElementsByTagName("ul")[0]) {
        this.getElementsByTagName("ul")[0].style.visibility = "visible";
      }
    },
    function() {
      if(this.getElementsByTagName("ul")[0]) {
        this.getElementsByTagName("ul")[0].style.visibility = "hidden";
      }
    }
    );
  }
});