//var script = '';

function getHttpRequest()
{
        if(window.XMLHttpRequest){
        http_request = new XMLHttpRequest();
        }
	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('Невозможно создат?экземп??класса XMLHTTP');
		return false;
	}
        if (http_request.overrideMimeType) {
		http_request.overrideMimeType('text/xml');
	}
	return http_request;
}

function setText(elem_id,text)
{
	var element = document.getElementById(elem_id);
	var text_old = element.innerHTML;
	element.innerText = text;
	return html_old;
}

function setHtml(elem_id,html)
{
	var element = document.getElementById(elem_id);
	var html_old = element.innerHTML;
	element.innerHTML = html;
	return html_old;
}

function serializeform(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] = elements[i].value;
             }
             else
             {
             	if(elements[i].checked)
             	params[elements[i].name] = 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 + '='+ encodeURIComponent(params[name]);
		else paramstr += name + '='+ encodeURIComponent(params[name]);
	}

	return paramstr;
}

function submitform(formname,target)
{
     var request = getHttpRequest();
        var form = document.forms[formname];
	var action = null;
	if(!form.action) action = window.location;
	else action = form.action;
	var params = 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;

	setIndicator('images/ajax-loader.gif',target);

	if(method == 'get') request.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
	if(method == 'post') request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

	request.open(method,url,true);
	request.send(data);
	//request.onreadystatechange = callback;
	request.onreadystatechange = function()
	{
		if(request.readyState == 4 && request.status == 200) setHtml(target,request.responseText);
	}
}

function load(url,target)
{
        var request = getHttpRequest();
        setIndicator('images/ajax-loader.gif',target);
        request.open('GET',url,true);
	request.send(null);

	request.onreadystatechange = function()
	{
		if(request.readyState == 4 && request.status == 200) setHtml(target,request.responseText);
	}
}

function setIndicator(src,target)
{
     setHtml(target,'<img src="'+src+'" />');
}