function myajax()

{

        if(window.XMLHttpRequest){

        request = new XMLHttpRequest();

        }

	else if (window.ActiveXObject) { // IE

	try {

		request = new ActiveXObject("Msxml2.XMLHTTP");

	}

	catch (e) {

	try {

		request = new ActiveXObject("Microsoft.XMLHTTP");

	}

	catch (e) {}

	}

	}

	if (!request) {

		alert('Невозможно создать экземпляр класса XMLHTTP');

		return false;

	}

        if (request.overrideMimeType) {

		request.overrideMimeType('text/xml');

	}



	this.request = request;



	this.indicator = null;

	this.onsuccess = null;

	this.onError = function()

	{

		alert('Error: ' + this.request.status + ' ' + this.request.statusText);

	}



	/*this.callback = function()

	{

		if(request.readyState != 4) return;

		if(request.status == 200)

		{

			if(this.onsuccess) this.onsuccess();

			else alert(request.responseText);

		}

		else

		{

			if(this.onError) this.onError();

			else alert(request.statusText);

		}

	}*/



        this.setType = function(type)

        {

    	        this.request.overrideMimeType(type);

        }



	this.setIndicator = function(src)

	{

		var img = new Image();

		img.src = src;

		this.indicator = src;

	}



	this.load = function(url,target)

	{

		if(this.indicator) document.getElementById(target).innerHTML = '<img src="'+this.indicator+'" />';

		if(url.indexOf('?') == -1)

		{

                    url += '?';

                }

                else

                {

                    url += '&';

                }

                url += 'ajax=1';

		this.request.open('get',url,true);

		this.request.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");

		this.request.send(null);



        //this.request.onreadystatechange = this.callback;

        onError = this.onError;

		this.request.onreadystatechange = function()

		{

			//alert(request.getResponseHeader('Content-type'));

			//alert(request.status);

			if(request.readyState != 4) return;

			if(request.status == 200)

			{

				if(request.getResponseHeader('Content-type') == 'text/xml')

				{

					var elems = request.responseXML.getElementsByTagName('set');

                	for(i=0;i<elems.length;i++)

                	{

                		var itemid = elems[i].getAttribute('elem');

                		var elem = document.getElementById(itemid);

                		elem.innerHTML = elems[i].firstChild.nodeValue;

	                }

	                var elem = document.getElementById(target);

	                elem.innerHTML = '';

				}

				else

				{

					elem = document.getElementById(target);//alert(request.getResponseHeader('Content-type'));

					/*if(request.getResponseHeader('Content-Length') > 0)*/ elem.innerHTML = request.responseText;
					elem.scrollIntoView();

				}

			}

			else

			{

				onError();

			}

		}

	}



	this.serializeform = function(formname)

	{

	var form = document.forms[formname];

	var elements = form.elements;

	var paramstr = '';



	var params = new Array();



	for(i = 0; i < elements.length; i++)

	{

		//alert(elements[i].value);

        if(elements[i].name)

		{

             if(elements[i].type != 'checkbox' && elements[i].type != 'radio') params[elements[i].name] = encodeURIComponent(elements[i].value);

             else

             {

             	if(elements[i].checked) params[elements[i].name] = encodeURIComponent(elements[i].value);

             }

             /*if(paramstr != '') paramstr += '&';

			paramstr += elements[i].name + '=' + encodeURIComponent(elements[i].value);*/

		}

	}



	params['ajax'] = 1;



	for(name in params)

	{

		if(paramstr != '') paramstr += '&' + name + '='+ params[name];

		else paramstr += name + '='+ params[name];

	}



	return paramstr;

}



	this.submitform = function(formname,target)

	{

		var form = document.forms[formname];

		var action = null;

		if(!form.action) action = window.location;

		else action = form.action;

		var params = this.serializeform(formname);

		var url = action;

		var data = null;

		var method = null;

		if(!form.method) method = 'get';

		else method = form.method;

		if(method == 'get') url += '?' + params;

		else data = params;



		if(this.indicator)

                {

                if(document.getElementById(target)) document.getElementById(target).innerHTML = '<img src="'+this.indicator+'" />';

                }



		this.request.open(method,url,true);

		if(method == 'get') this.request.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");

        if(method == 'post') this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');



		onError = this.onError;

		this.request.onreadystatechange = function()

		{



			if(request.readyState != 4) return;

			if(request.status == 200)

			{

				if(request.getResponseHeader('Content-type').indexOf('text/xml') != -1)

				{



                                        var elem = document.getElementById(target);

                                        elem.innerHTML = '';
                                        elem.scrollIntoView();

                                        var elems = request.responseXML.getElementsByTagName('set');

                	for(i=0;i<elems.length;i++)

                	{

                		var itemid = elems[i].getAttribute('elem');

                		var elem = document.getElementById(itemid);

                		if(elems[i].firstChild != null) elem.innerHTML = elems[i].firstChild.nodeValue;

	                }







				}

				else

				{

					elem = document.getElementById(target);//alert(request.getResponseHeader('Content-type'));

					/*if(request.getResponseHeader('Content-Length') > 0)*/ elem.innerHTML = request.responseText;

				}

			}

			else

			{

				onError();

			}

		}



		this.request.send(data);

	}



	return this;

}



var ajax = new myajax();