//////////////////////////////////////////////////
//  code for flipping layer visibilities

//Mask the DOM

if(document.layers){
// for NetScape
  pre = 'document.';
  post = '';
}

if(document.getElementById){
// something else  (mac?)
  pre = 'document.getElementById("';
  post = '").style';
}

if(document.all){
// Internet Explorer
  pre = 'document.all.';
  post = '.style';
}

//var initialLayer = 'text_content';
//var currentLayer = initialLayer;

function showLayer(lyr){
  if (navigator.appName.indexOf ("Microsoft") !=-1) {
//      hideLayer(currentLayer);
      eval(pre + lyr + post).visibility = 'visible';
//      currentLayer = lyr;
   }
  else {
      eval(pre + lyr + post).visibility = 'show';
  }
}

function hideLayer(lyr){
  if (navigator.appName.indexOf ("Microsoft") !=-1) {
    eval(pre + lyr + post).visibility = 'hidden';
  }
  else {
    eval(pre + lyr + post).visibility = 'hide';
  }
}