<code lang="Javascript">var XMLRequest=Object();
XMLRequest.buildQuery = function (query) {
	var data="";
	var first="?";
	for (i in query) {
		data+=first+escape(i)+"="+escape(query[i]);
		first="&";
	}
	return data;
}
XMLRequest.GET = function (url, query, callback, fallback) {
	var xmlhttp=null;
	if (window.XMLHttpRequest) {
		xmlhttp=new XMLHttpRequest()
	} else if (window.ActiveXObject) {
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	if (xmlhttp!=null) {
		xmlhttp.onreadystatechange=function () {
			if (xmlhttp.readyState==4) {
				if (xmlhttp.status==200) callback(xmlhttp);
				else fallback(xmlhttp);
			}
		}
		var data = XMLRequest.buildQuery(query);
		xmlhttp.open("GET",url+data,true);
		xmlhttp.send("");
	}else{
		alert("Your browser does not support XMLHTTP.")
	}
}
XMLRequest.POST = function (url, query, form, callback, fallback) {
	var xmlhttp=null;
	if (window.XMLHttpRequest) {
		xmlhttp=new XMLHttpRequest()
	} else if (window.ActiveXObject) {
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	if (xmlhttp!=null) {
		xmlhttp.onreadystatechange=function () {
			if (xmlhttp.readyState==4) {
				if (xmlhttp.status==200) {
					callback(xmlhttp);
				} else {
					fallback(xmlhttp);
				}
					
			}
		}
		var urldata = XMLRequest.buildQuery(query);
		var postdata = XMLRequest.buildQuery(form).substr(1);
		xmlhttp.open("POST",url+urldata,true);
		xmlhttp.setRequestHeader("Content-type" , "application/x-www-form-urlencoded");
		xmlhttp.setRequestHeader("Content-length", postdata.length);
		xmlhttp.setRequestHeader("Connection", "close");
		xmlhttp.send(postdata);
	}else{
		alert("Your browser does not support XMLHTTP.")
	}
}</code>