var xmlHttp
var localWhereToPut
var changeMethod
var orginal

function updateBlock(pageToFetch,whereToPut,m)
{ 
	orginal = document.getElementById(whereToPut).innerHTML;

	if(m=='append'){
	 	document.getElementById(whereToPut).innerHTML   = orginal+"<img src='/images/loading.gif' border=0>";
	 }else{
	 	document.getElementById(whereToPut).innerHTML   = "<img src='/images/loading.gif' border=0>";
	 }
	if(m==null){
		m = "update";
	}
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
		{
			alert ("Sorry you cannot run AJAX Applications.")
			return
		} 
	var url=pageToFetch
	localWhereToPut = whereToPut
	changeMethod = m

	xmlHttp.onreadystatechange=stateChanged
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}


function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
		{ 
			if(changeMethod!='append'){
            document.getElementById(localWhereToPut).innerHTML   = xmlHttp.responseText;  
            }else{
             document.getElementById(localWhereToPut).innerHTML   = orginal +  xmlHttp.responseText; 
            }
            return true;
			localWhereToPut = ""
			changeMethod = ""
		} 
} 

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

var http_request = false;
   var localWhereToPut = "";
   
   function makePOSTRequest(url, parameters, whereToPut, changeMethod) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      localWhereToPut = whereToPut;
	  http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            alert(http_request.responseText);
            result = http_request.responseText;
           
            if(changeMethod!='append'){
            document.getElementById(localWhereToPut).innerHTML   = result;   
            }else{
             document.getElementById(localWhereToPut).innerHTML   = orginal + result; 
            }
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get(obj, whichPage, whereToPut, whatToPost) {
	 makePOSTRequest(whichPage, whatToPost, whereToPut);
   }
   
function getRooms(currentrooms){
	if(document.searchForm.city.options[document.searchForm.city.selectedIndex].value!=""){
	updateBlock('getRoomsList.php?city='+document.searchForm.city.options[document.searchForm.city.selectedIndex].value+"&rooms="+currentrooms,'roomContainer','replace');
	}
}

function getCity(currentcity){
	if(document.searchForm.state.options[document.searchForm.state.selectedIndex].value!=""){
	updateBlock('getCityList.php?state='+document.searchForm.state.options[document.searchForm.state.selectedIndex].value+"&city="+currentcity,'cityContainer','replace');
	}
}