var http_request = false;
var response_text = "d";

function ajax_test_support() {

	var test_http_request = null;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		test_http_request = true;
	} else if (window.ActiveXObject) { // IE
		try {
			test_http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				test_http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	
	if (!test_http_request) {
		return false;
	}
	test_http_request = null;
	return true;
}

function makeRequest(request_type, url, parameters) {

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	
	if (!http_request) {
		return false;
	}
	
	http_request.onreadystatechange = capture_result;
	if(request_type == 'POST') {
		http_request.open('POST', url, true);
		//http_request.overrideMimeType('text/html');
		http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http_request.setRequestHeader("Content-length", parameters.length);
		http_request.setRequestHeader("Connection", "close");
		http_request.send(parameters);
	}
	else {
		http_request.open('GET', url + parameters, true);
		http_request.send(null);
	}
	
	return true;
	
}

function capture_result() {
	   if ((http_request.readyState == 4) && (http_request.status == 200)) 
		 	response_text = http_request.responseText;
}