function afficherLayer(pLayer, pMode)
{
  if ((document.getElementById) && (pLayer != ""))
  {
    var layer = document.getElementById(pLayer);
    
    if ((layer != null) && (typeof layer != "undefined"))
      layer.style.display = pMode;
  }
}

function changerCouleurFondLayer(pLayer, pCouleur)
{
  if ((document.getElementById) && (pLayer != ""))
  {
    var layer = document.getElementById(pLayer);
    
    if ((layer != null) && (typeof layer != "undefined"))
      layer.style.backgroundColor = pCouleur;
  }
}

function changerImageFondLayer(pLayer, pUrlImage)
{
  if ((document.getElementById) && (pLayer != ""))
  {
    var layer = document.getElementById(pLayer);
    
    if ((layer != null) && (typeof layer != "undefined") && (pUrlImage != ""))
      layer.style.backgroundImage = "url(" + pUrlImage + ")";
  }
}