function getXhr(){
	
	if (window.XMLHttpRequest)                 //  Objet de la fenêtre courant
	{ 
	    xhr = new XMLHttpRequest();     //  Firefox, Safari, ...
	} 
	else 
	   if (window.ActiveXObject)                    //  Version Active
	   {
	      xhr = new ActiveXObject("Microsoft.XMLHTTP");   // Internet Explorer 
	   }
	return xhr;
}

function sender(params){
	xhr.open('POST','ajax_caller.php', true);
	xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xhr.setRequestHeader("Content-length", params.length);
	xhr.setRequestHeader("Connection", "close");
	
	xhr.send(params); 
}


function appelAjax4Menu(page){
	
	getXhr();
	
	var tab_post = new Array();	
	
	xhr.onreadystatechange = function(){ 
			
		if (xhr.readyState == 4) { 
			if(xhr.status  == 200){ 
				
				var result = xhr.responseText;
				//alert(result);
				document.getElementById('message').innerHTML = result;
				
			}else{ 
            	 alert("Error code " + xhr.status);
			}
		}
	}
		
	var params = "ajax=true";
		params += "&page="+page;
		
		sender(params); 
}