function file(fichier)
  {
  	if(window.XMLHttpRequest)
  		xhr_object = new XMLHttpRequest();
  	else if(window.ActiveXObject)
  		xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
  	else
  		return(false);
  	xhr_object.open("GET", fichier, false);
  	xhr_object.send(null);
  	if(xhr_object.readyState == 4)
  		return(xhr_object.responseText);
      else
  		return(false);
  }
  

  function loadNewDoc(doc)
  {
  	$("#mainContainer").html(file(doc));
  }