// updates the content of advertisements box
function displayAdvertisements()
{
  addDependentCallback(function()
    {
      readRssIntoElementWithId( 'advertisementsbox', advertisementsUrl, advertisementsNumberOfItems );
    }, 
    'announces,advertisementsContainer,helperFunctions,ajax'
  );
}

// starts running and updating this box
function startAdvertisementsBoxUpdate()
{
  displayAdvertisements();
}

// dependency is loaded
dependencyLoaded('advertisements');