function ChangeListe(id) {
    var form = id;
		var res = callServer('ajax/html/'+ form +'.html');
		document.getElementById('contenu').innerHTML = res;
	}
	
	function callServer(fichier)
	{
		if(window.XMLHttpRequest) // FIREFOX
			xhr_object = new XMLHttpRequest(); 
		else if(window.ActiveXObject) // IE
			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);
}