/* AJAX stuff */
var xmlHttp;

function GetXmlHttpObject(handler) { 
	var objXmlHttp = null;

	if (navigator.userAgent.indexOf('Opera')>=0) {
		alert('This example doesnt work in Opera'); 
		return; 
	}
	if (navigator.userAgent.indexOf('MSIE')>=0) { 
		var strName='Msxml2.XMLHTTP';
		if (navigator.appVersion.indexOf('MSIE 5.5')>=0) {
			strName='Microsoft.XMLHTTP';
		} 
		try { 
			objXmlHttp=new ActiveXObject(strName);
			objXmlHttp.onreadystatechange=handler; 
			return objXmlHttp;
		} 
		catch(e) { 
			alert('Error. Scripting for ActiveX might be disabled'); 
			return; 
		} 
	} 
	if (navigator.userAgent.indexOf('Mozilla')>=0) {
		objXmlHttp=new XMLHttpRequest();
		objXmlHttp.onload=handler;
		objXmlHttp.onerror=handler; 
		return objXmlHttp;
	}
}