var http_request = false;
var global_error = 0;
var asyncFunctionPointer = function() {};

function makeRequest(url, asyncFunction, param) {
	http_request = false;
	asyncFunctionPointer = asyncFunction;
	
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
		}
	}
	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) {
		alert('Giving up :( Cannot create an XMLHTTP instance');
		global_error = 1;
		return false;
	}
	http_request.onreadystatechange = alertContents;
	if (param == '') {	
		http_request.open('GET', url, true);
		http_request.send(null);
	}
	else {
		if (eval("document._adm_form." + param + ".value.length>0")) {
			http_request.open('POST', url, true);
			http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
			http_request.send('text='+encodeURIComponent(eval("document._adm_form." + param + ".value")));
		}
		else eval("document.getElementById('wait_lebedev" + param + "').style.display='none';");
	}
}

function alertContents() {
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			asyncFunctionPointer();
		}
		else {
			global_error = 2;
			alert('There was a problem with the request.');
		}
	}
	//alert(http_request.readyState);
}
	
// -----

function add2cart(id, n) {
	makeRequest(site_place + 'cart.php?id=' + id + '&n=' + n, updateCart, '');
}

function updateCart() {
	var root_node = http_request.responseXML.getElementsByTagName('root')[0];
	var tmp_message = '';
	for (i=0; i<root_node.getElementsByTagName('message').length; i++) {
		tmp_message += root_node.getElementsByTagName('message')[i].firstChild.data;
	}
	document.getElementById('cart_id').innerHTML = tmp_message;
	alert('Товар добавлен в корзину!');
}