function displayText(area) { // show and hide text in span's
  var allLayers = document.all ?
    document.all.tags('div') :
    document.getElementsByTagName ?
      document.getElementsByTagName('div') :
      new Array();

  for (var loop=0; loop<allLayers.length; loop++) { // loop through array of elements hiding navigation
    if (allLayers[loop].id == area) {
      if (allLayers[loop].style.display == 'block') {
        allLayers[loop].style.display = 'none';
      } else {
        allLayers[loop].style.display = 'block';
      }
    }
  }
}