$(document).ready(function() {
  $('#main-menu li[id^=menu-]').hover(
    function() {
      $(this).children('a').children('div').addClass('active');
      var submenu = $(this).children('ul');
      if(submenu.length > 0) {
        submenu.show();
      }
    },
    function() {
      $(this).children('a').children('div').removeClass('active');
      var submenu = $(this).children('ul');
      if(submenu.length > 0) {
        submenu.hide();
      }
    }
  );

  $('#search_button').click(function() {
    $('#search_form').submit();
  });

  $('#search_form').submit(function() {
    if($('input[name=keyword]').val().length < 4) {
      alert('Please enter at least 4 characters search keyword.');
      return false;
    } else {
      return true;
    }
  });
});