function toggleMenu(content_element, menu_element, expanded_image, collapsed_image) {
  if ($j('#'+content_element).is(':visible')) {
    $j('#'+menu_element).attr('src', expanded_image);
  }
  else {
    $j('#'+menu_element).attr('src', collapsed_image);
  }

  $j('#'+content_element).slideToggle('fast');
}