// form properties
var setupFormName = 'setup_information';
var setupForm_navigationLevel1_txt = 'navigation_level1_text';
var setupForm_navigationLevel1_url = 'navigation_level1_url';
var setupForm_navigationLevel2_txt = 'navigation_level2_text';
var setupForm_navigationLevel2_url = 'navigation_level2_url';
var setupForm_activeMenuItem       = 'menu_active';

// navigation bar properties
var navigation_level1_id  = 'navigation_level1';
var navigation_level2_id  = 'navigation_level2';


function init()
  {
   setupForm  = document.getElementById(setupFormName);
   nav_level1 = document.getElementById(navigation_level1_id);
   nav_level2 = document.getElementById(navigation_level2_id);

   // read form data
   nav_level1_txt = setupForm.elements[setupForm_navigationLevel1_txt].value;
   nav_level1_url = setupForm.elements[setupForm_navigationLevel1_url].value;
   nav_level2_txt = setupForm.elements[setupForm_navigationLevel2_txt].value;
   nav_level2_url = setupForm.elements[setupForm_navigationLevel2_url].value;
   activeMenu = setupForm.elements[setupForm_activeMenuItem].value;

   // update navigation bar
   if (nav_level1_txt != "" && nav_level1_url != null)
     {
      // update contents
      nav_level1.childNodes[1].firstChild.data = nav_level1_txt;
      nav_level1.childNodes[1].href            = buildURL(nav_level1_url);
      // display contents
      nav_level1.style.display = "inline";

      if (nav_level2_txt != "" && nav_level2_url != null)
        {
         // update contents
         nav_level2.childNodes[1].firstChild.data = nav_level2_txt;
         nav_level2.childNodes[1].href            = buildURL(nav_level2_url);
         // display contents
         nav_level2.style.display = "inline";
        };
     };

   // update menu
   menu_setActive(activeMenu);
   

  };