function setTopMenu() {
    var strNav = '', strPage;
    var sPath = window.location.pathname;
    var strPage = sPath.substring(sPath.lastIndexOf('/') + 1);


      if (strPage == '') {strNav = 'nav1'; }
      if (strPage == 'index.php') {strNav = 'nav1'; }
      if (strPage == 'first_time_buyer.php') {strNav = 'nav2'; }
      if (strPage == 'remortgage.php') {strNav = 'nav3'; }
      if (strPage == 'bad_credit_mortgage.php') {strNav = 'nav4'; }
      if (strPage == 'self_certification.php') {strNav = 'nav5'; }
      if (strPage == 'buy_to_let_mortgage.php') {strNav = 'nav6'; }
      if (strPage == 'free_online_quote.php') {strNav = 'nav7'; }


      if (strNav != '') {
        document.getElementById(strNav).className = 'menu_selected';
      }

  }