var xmlHttp2;
function change_month(month, date)
   { 
    xmlHttp2=GetXmlHttpObject();
    if (xmlHttp2==null)
       {
        alert ("Browser does not support HTTP Request");
        return;
       }              
var url="/calendar.php";
url=url+'?month='+month;
url=url+'&date='+date;
xmlHttp2.open("GET",url,true);
xmlHttp2.onreadystatechange=stateChanged2; 
xmlHttp2.send(null);
   }           
function stateChanged2() 
   { 
    if (xmlHttp2.readyState==4 || xmlHttp2.readyState=="complete")
       { 
        var response = xmlHttp2.responseText;
        document.getElementById("month").innerHTML = response;
       } 
   }

function GetXmlHttpObject2()
   {
    var xmlHttp2=null;
    try
       {
        // Firefox, Opera 8.0+, Safari
        xmlHttp2=new XMLHttpRequest();
       }
        catch (e)
       {
       //Internet Explorer
       try
          {
           xmlHttp2=new ActiveXObject("Msxml2.XMLHTTP");
          }
           catch (e)
              {
               xmlHttp1=new ActiveXObject("Microsoft.XMLHTTP");
              }
          }
    return xmlHttp2;
   }