var xmlHttp;

function checkDate(){
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp===null){
		alert ("Browser does not support HTTP Request");
		return;
	}
	
	var arrival = document.getElementById("date_arr").value;
	var departure = document.getElementById("date_dep").value;
	var roomtype = document.bookingform.roomtype.options[document.bookingform.roomtype.options.selectedIndex].value;
	var people = document.bookingform.personcount.options[document.bookingform.personcount.options.selectedIndex].value;
	var rooms = document.bookingform.roomamount.options[document.bookingform.roomamount.options.selectedIndex].value;
	if(arrival !== "" && departure !== "" && roomtype !== "" && roomtype !== "---" && people !== "---" && rooms !== ""){
		var url="bookings/booking.php";
		url=url+"?arrival="+arrival+"&departure="+departure+"&roomtype="+roomtype+"&people="+people+"&rooms="+rooms;
		url=url+"&sid="+Math.random();
		xmlHttp.onreadystatechange=stateChanged;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
	}
}

function stateChanged(){ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
		document.getElementById("rate").innerHTML=xmlHttp.responseText;
	} 
} 

function GetXmlHttpObject(){ 
	var objXMLHttp=null;
	if (window.XMLHttpRequest){
		objXMLHttp=new XMLHttpRequest();
	}else if (window.ActiveXObject){
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}