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