$(document).ready(function() {
  $('#header .menu li').hover(
    function () {
      $(this).children('a.rel-block').addClass("active");
      $(this).children('.submenu').css("display","block");
    },
    function () {
      $(this).children('a.rel-block').removeClass("active");
      $(this).children('.submenu').css("display","none");
    }
  );
});