http://planeta-zemla.ru/js/jcomments/ajax.js?v=1

1/* based on xajax Javascript library (http://www.xajaxproject.org) */
2if (!window.jtajax) {
3
4function jtAJAX()
5{
6	this.options = {url: '',type: 'post',nocache: true,data: ''};
7
8	this.$ = function(id) {if(!id){return null;}var o=document.getElementById(id);if(!o&&document.all){o=document.all[id];}return o;};
9	this.extend = function(o, e){for(var k in (e||{}))o[k]=e[k];return o;};
10	this.encode = function(t){return encodeURIComponent(t);};
11	this.setup = function(options) {this.options = this.extend(this.options, options);};
12
13	this.xhr = function()
14	{
15		var xhr = null;
16		if ('undefined' != typeof XMLHttpRequest) xhr = new XMLHttpRequest();
17		if (!xhr && 'undefined' != typeof ActiveXObject) {
18			var msxmlhttp = new Array('Msxml2.XMLHTTP.4.0','Msxml2.XMLHTTP.3.0','Msxml2.XMLHTTP','Microsoft.XMLHTTP');
19			for (var i=0;i<msxmlhttp.length;i++){try{xhr=new ActiveXObject(msxmlhttp[i]);}catch(e){xhr=null;}}
20		}
21		return xhr;
22	};
23	
24	this.form2query = function(sId)
25	{
26		var frm = this.$(sId);
27		if (frm && frm.tagName.toUpperCase() == 'FORM') {
28			var e = frm.elements, query = [];
29			for (var i=0; i < e.length; i++) {
30				var name = e[i].name, value;
31				if (!name) continue;
32				if (e[i].type && ('radio' == e[i].type || 'checkbox' == e[i].type) && false === e[i].checked) continue;
33				if ('select-multiple' == e[i].type) {
34					for (var j = 0; j < e[i].length; j++) {
35						if (true === e[i].options[j].selected)
36							query.push(name+"="+this.encode(e[i].options[j].value));
37					}
38				} else { query.push(name+"="+this.encode(e[i].value)); 
39				}
40			}
41			return query.join('&');
42		}
43		return '';
44	};
45
46	this.startLoading = function(){};
47	this.finishLoading = function(){};
48
49	this.ajax = function(options)
50	{
51		var xhr = this.xhr();
52		if (!xhr) return false;
53		var o = this.extend(this.options, options);
54		var url = o.url, jtx = this;
55		var r=url;var h=location.hostname,d,i1,i2;i1=r.indexOf('://');if(i1!=-1){i2=r.indexOf('/',i1+3);if(i2!=-1){d=r.substring(i1+3,i2);if(d!=h){if(location.port!=''){h=h+':'+location.port;}r=r.replace(d,h);url=r;}}}
56		
57		if ('get' == o.type) {
58			if (true === o.nocache) {
59				var ts=new Date().getTime();
60				url += (url.indexOf("?")==-1 ? '?' : '&') + '_jtxr_' + ts;
61			}
62			if (o.data) {
63				url += (url.indexOf("?")==-1 ? '?' : '&') + o.data;
64				o.data = null;
65			}
66		}
67
68		xhr.open(o.type.toUpperCase(), url, true);
69
70		if ('post' == o.type)
71			try {xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");}catch(e){}
72		if (true === o.nocache)
73			xhr.setRequestHeader('If-Modified-Since', 'Thu, 01 Jan 1970 00:00:00 GMT');
74
75		xhr.onreadystatechange = function() {
76			if (xhr.readyState != 4) return;
77			jtx.finishLoading();
78			if (xhr.status==200) {
79				jtx.processResponse(xhr.responseText);
80			}
81			delete xhr;
82			xhr = null;
83		};
84		try {
85			jtx.startLoading();
86			xhr.send(o.data);
87		} catch(e) { jtx.finishLoading(); }
88
89		delete jtx;
90		delete xhr;
91		delete o;
92		return true;
93	};
94
95	this.call = function(sFunction, aArgs, sType, sForm)
96	{
97		var params = 'jtxf=' + this.encode(sFunction);
98		if (aArgs) {
99			for (var i=0;i<aArgs.length;i++) {
100				params += '&jtxa[]=' + this.encode(aArgs[i]);
101			}
102		} else if (sForm) {
103			params += '&' + this.form2query(sForm);
104		}
105
106		this.ajax({type: sType, data: params});
107		return true;
108	};
109
110	this.processResponse = function(sText)
111	{
112		if(sText==='') return false;
113
114		if(sText.substring(0,3)!='[ {'){
115			var idx=sText.indexOf('[ {');
116			sText=sText.substr(idx);
117		}
118		var result;
119		try {
120			result=eval(sText);
121		}catch(e){}
122
123		if ('undefined' == typeof result) {return false;}
124		
125		var cmd, id, property, data, obj = null;
126		for (var i=0;i<result.length;i++) {
127			cmd 		= result[i]['n'];
128			id 		= result[i]['t'];
129			property	= result[i]['p'];
130			data 		= result[i]['d'];
131			obj 		= this.$(id);
132
133			switch(cmd) {
134				case 'as': if(obj){eval("obj."+property+"=data;");} break;
135				case 'al': if(data){alert(data);} break;
136				case 'js': if(data){eval(data);} break;
137				default: this.error('Unknown command: ' + cmd);break;
138			}
139		}
140		
141		delete result;
142		delete cmd;
143		delete id;
144		delete property;
145		delete data;
146		delete obj;
147		return true;
148	};
149
150	this.error = function(){};
151}
152var jtajax = new jtAJAX();
153}