var xmlHttp

function getCalendar()
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="booking_calendar_details.asp";
url=url+"?arrival="+document.form_dates.arrivaldate.value;
url=url+"&departure="+document.form_dates.departuredate.value;
url=url+"&prop_id="+document.form_dates.prop_id.value;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
document.getElementById("txtCalendar").innerHTML="<center><img src='images/ajax-loader.gif' width='48' height='48' /></center>";
//document.getElementById("txtButtons").innerHTML="";
//document.submitbooking.submit.disabled=true;
}

function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("txtCalendar").innerHTML=xmlHttp.responseText;
if (xmlHttp.responseText.indexOf('Sorry') >= 0)
{
document.getElementById("txtButtons").innerHTML="<center><input type=\"button\" name=\"date_submit\" id=\"date_submit\" value=\"Check Availability\" onclick=\"getCalendar()\" /></center>";
}
else
{
document.getElementById("txtButtons").innerHTML="<center><input type=\"button\" name=\"date_submit\" id=\"date_submit\" value=\"Search Dates\" onclick=\"getCalendar()\" /><input name=\"Submit\" type='submit' title='Online Booking' value='Next'/></center>";
document.form_dates.arrival.value=document.form_dates.arrivaldate.value;
document.form_dates.departure.value=document.form_dates.departuredate.value;
}
}
}

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;
}