var xmlHttp

// Funtion for view cooment in existing session
function show_calender(str)
{
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="show_calender.php";
url=url+"?action="+str;
//alert(url);
xmlHttp.onreadystatechange=stateshow_month;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateshow_month() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("left_div_cal").innerHTML=xmlHttp.responseText;
}
}
//--------------------------------------------------------End---------------------------------------------------------------

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