var xmlhttp

function showStudyOption(str)
{
document.getElementById("txtHint").innerHTML="<div style='clear:both;'></div><div align='center'><img src='ajax-loader.gif' /></div>";
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
var url="getstudyoption.php";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function getroom(str)
{
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null)
  	{
  		alert ("Your browser does not support AJAX!");
  		return;
  	}
	var start_date = "";
	var end_date = "";
	if(document.getElementById('start_date')){start_date = document.getElementById('start_date').value;}
	if(document.getElementById('end_date')){end_date = document.getElementById('end_date').value;}
		
	var url="getroom.php";
	url=url+"?q="+str+"&start_date="+start_date+"&end_date="+end_date;
	url=url+"&sid="+Math.random();
	xmlhttp.onreadystatechange=stateChanged;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}

function stateChanged(){
	if (xmlhttp.readyState==4){
		document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
	}
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}