//create ajax object
function ajax() {
	var xml_http=false;
	try {
		xml_http = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
			xml_http = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xml_http = false;
		}
	}
	if (!xml_http && typeof XMLHttpRequest!='undefined') {
		xml_http = new XMLHttpRequest();
	}
	return xml_http;
}