$(document).ready(function(){ 
    
    /**
     * Show only the secondary navigation for
     * the selected item
     *
     */

    // Body class
    var bodyClass = $('body').attr("class");
    
    // Hide all the submenu's
    $('ul.submenu').hide();

    // Add the class
    $('li#nav-'+bodyClass).addClass("active");
    
    // Show the active submenu
    $('li#nav-'+bodyClass+' ul.submenu').show();
    
    
});