var req;
var reqTimeout;
var select_field;
var form_name;
 
function loadXMLDoc(url) {
    req = null;
    // select_field = select_id;
	// form_name = form_id;
    if (window.XMLHttpRequest) {
        try {
            req = new XMLHttpRequest();
        } catch (e){}
    } else if (window.ActiveXObject) {
        try {
            req = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e){
            try {
                req = new ActiveXObject('Microsoft.XMLHTTP');
            } catch (e){}
        }
    }
 
    if (req) {
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
        reqTimeout = setTimeout("req.abort();", 5000);
    } else {
        alert("Браузер не поддерживает AJAX");
    }
}
 
function processReqChange() {
    if (req.readyState == 4) {
        clearTimeout(reqTimeout);

        // only if "OK"
        if (req.status == 200) {
            SelectList(select_field, req.responseText);

        } else {
            alert("Не удалось получить данные:\n" + req.statusText);
        }
    }  
}

function SelectList (select_id, data){
	var select = document.getElementById(select_id);

	select.options.length = 0;
	if(data.length == 0) return;

	var arr = data.split('\n');
	for(var i in arr){
		val = arr[i].split('=');
		select.options[select.options.length] = new Option(val[1], val[0], false, false);
		}
	}


function stat(n)
{
  switch (n) {
    case 0:
      return "не инициализирован";
    break;
 
    case 1: 
      return "загрузка...";
    break;
 
    case 2: 
      return "загружено";
    break;
 
    case 3: 
      return "в процессе...";
    break;
 
    case 4: 
      return "готово";
    break;
 
    default:
      return "неизвестное состояние";  
  }  
}
 
function requestdata(params, url, select_id, form_id){
	select_field = select_id;
	form_name = form_id;
	loadXMLDoc(url + params);
	}