function ajaxAsyncRequest(url, callback, params, method) {

	var xmlHttp;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	xmlHttp.onreadystatechange = function() {
		if(xmlHttp.readyState == 4) {
			var response = xmlHttp.responseText + "";
			if (callback != null)
				callback(params, response);
			//try {
			//} catch (err) {
			//	alert(err);
			//}
		}
	}

	xmlHttp.open(method, url, true);
	xmlHttp.send(null);
}


function ajaxSyncRequest(url, method) {

	var xmlHttp;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	xmlHttp.open(method, url, false);
	xmlHttp.send(null);
	return xmlHttp.responseText;
}