// JavaScript Document (AJAX)

var xmlHttp;
var xmlField;

// set XMLHttp object control (browser dependent)
function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
		if(xmlHttp.overrideMimeType){
			xmlHttp.overrideMimeType('text/html; charset=iso-8859-1');
		}
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e) {
                alert("Your browser does not support AJAX!");
                return false;
            }
		}
	}
	return xmlHttp;
}

// function to display text hints
// page    : URL being called
// qurey   : Query string provided
// id_ref  : page section id name
function updatePage(page, query, id_ref) {
	
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null) {
		alert ("Your browser does not support AJAX!");
		return;
	} 
	
	xmlField = id_ref;
	url = page + "?" + query;
//alert(url);
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("POST",url,true);
	xmlHttp.setRequestHeader("Content-Type", "text/html; charset=iso-8859-1"); 
	xmlHttp.send(url);
} 

// check state prior to updating
// id_ref  : page section id name
function stateChanged() { 
	if (xmlHttp.readyState==4)	{ 
		document.getElementById(xmlField).innerHTML=xmlHttp.responseText;
	}
}