// Taken from: http://forums.devarticles.com/javascript-development-22/update-div-contents-dinamically-8214.html

var http_request = false;
var localWhereToPut = "";
   
   function makePOSTRequest(url, parameters, whereToPut) {
      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;
            document.getElementById(localWhereToPut).innerHTML   = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
function get(obj, whichPage, whereToPut, whatToPost) {
	makePOSTRequest(whichPage, whatToPost, whereToPut);
}
   
var xmlHttp;
var localWhereToPut;

function showPage(pageToFetch,whereToPut)
{ 
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
		{
			alert ("Sorry you cannot run AJAX Applications.");
			return;
		} 
	var url=pageToFetch;
	localWhereToPut = whereToPut;
	//url=url+"?q="
	//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(localWhereToPut).innerHTML=xmlHttp.responseText;
			localWhereToPut = "";

		} 
} 

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