var req;

function getXMLHttp()
{
  var xmlHttp
  try
  {
    //Firefox, Opera 8.0+, Safari
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    //Internet Explorer
    try
    {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e)
    {
      try
      {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch(e)
      {
        alert("Your browser does not support AJAX!")
        return false;
      }
    }
  }
  return xmlHttp;
}

function navigate(month,year)
{
  var url = "modules/mod_blocks/calendar.php?m="+month+"&y="+year+"";
  var xmlHttp = getXMLHttp();
  
  xmlHttp.onreadystatechange = function()
  {
    if(xmlHttp.readyState == 4)
    {
      HandleResponse(xmlHttp.responseText);
    }
  }
  var dt = new Date( ).valueOf();
  xmlHttp.open("POST", url + "&dt="+ dt, true); 
  xmlHttp.send(null);

}

function HandleResponse(response)
{
  document.getElementById('calendar').innerHTML = response;
}