.loading-invisible
	{
	display:none;
	}
.loading-visible
	{
    display:block;
    position:absolute;
    top:0px;
    left:0;
    width:100%;
	height: 100%;
    text-align:center;
    /*in supporting browsers, make it
      a little transparent*/
	background-image: URL("../pics/loading.gif");
	background-repeat: no-repeat;
	background-attachment: fixed;
	background-position:center; 
	}
 
  /* affiche  le  l'image d'attente de chargement (loading)
!!!!!! NE PAS OUBLIER DE COLLER LE CODE QUI SUIT JUSTE APRES LA BALISE <BODY> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<div id="loading" class="loading-invisible">
  <p><img src='pics/loading.gif'></p>
</div>
<script type="text/javascript">
  document.getElementById("loading").className = "loading-visible";
  window.onload=function(){
    document.getElementById("loading").className = "loading-invisible";
  }
</script>
 */