function ajax_item(e) {
	if (typeof e == 'string') e = document.getElementById(e);
	return e
};

function collect(a, f) {
	var n = [];
	for (var i = 0 ; i < a.length; i++) {
		var v = f(a[i]);
		if (v != null) n.push(v)
	}
	return n
};

ajax = {};
ajax.x = function() {
	try {
		return new ActiveXObject('Msxml2.XMLHTTP')
	} catch(e) {
		try {
			return new ActiveXObject('Microsoft.XMLHTTP')
		} catch(e) {
			return new XMLHttpRequest()
		}
	}
};

ajax.serialize = function(f) {
	var g = function(n) {
		return f.getElementsByTagName(n)
    };
	var nv = function(e) {
		if (e.name) {
			return encodeURIComponent(e.name) + '=' + encodeURIComponent(e.value);
		} else {
			return '';
		}
    };
	var i = collect(g('input'), function(i) {
			if ((i.type != 'radio' && i.type != 'checkbox') || i.checked) return nv(i)
		});
	var s = collect(g('select'), nv);
	var t = collect(g('textarea'), nv);
	return i.concat(s).concat(t).join('&');
};
  
ajax.send = function(u, f, m, a) {
	var x = ajax.x();
	x.open(m, u, true);
	x.onreadystatechange = function() {
		if (x.readyState == 4)
			f(x.responseText)
	};
	if (m == 'POST')
		x.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
	x.send(a)
};

ajax.get = function(url, func) {
	ajax.send(url, func, 'GET')
};

ajax.gets = function(url) {
	var x = ajax.x();
	x.open('GET', url, false);
	x.send(null);
	return x.responseText
};

ajax.post = function(url, func, args) {
	ajax.send(url, func, 'POST', args)
};

ajax.update = function(url, elm) {
	var e = ajax_item(elm);
	var f = function(r) {
		e.innerHTML = r
	};
	ajax.get(url, f)
};

ajax.submit = function(url, elm, frm) {
	var e = ajax_item(elm);
	var f = function(r) {
		e.innerHTML = r
	};
	ajax.post(url, f, ajax.serialize(frm))
};