function createXMLHttpRequest(cbFunc) {
	var XMLhttpObject = null;
	try {
		XMLhttpObject = new XMLHttpRequest();
	}
	catch(e) {
		try {
			XMLhttpObject = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try {
				XMLhttpObject = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {
				return null;
			}
		}
	}
	if (XMLhttpObject) XMLhttpObject.onreadystatechange = function(){cbFunc(XMLhttpObject)};
	return XMLhttpObject;
}

function unix_time () {
	return new Date/1e3|0;
}