var sitename='wrappers.ru';
var loading = 0;
var rr;
var le='';
var cmd=0;
var cmdf;
var lvs;
var nt = '';

function GetInfo()
{
  if (req.readyState == 4)
  {
    if (req.status == 200)
    {
      loading = 0;
      nt = req.responseText;
      if (nt.length>0)
      {
      	if (rr)
          rr(nt);
      }
      else
        alert("Пустой ответ.\r\nКод ошибки - "+req.status+
        ".\r\nСбой какой-то. Программера - расстрелять. Страницу - обновить.");
    }
    else
    {
      loading = 0;
      if (req.status>12000)
        alert(req.responseText);
      rr('<na>');
    }
  }
}

function LoadFromTo(Url,PostInfo,element,waitmessage,errormessage,md,mdFunc)
{
  lvs=document.getElementById(element);
  if ((lvs) || (element==''))
  {
    if (md!=2)
      if (lvs)
        lvs.innerHTML='<center>'+waitmessage+'<br><img src="http://'+sitename+'/pictures/loading.gif"></center>';
      else
      {
        document.getElementById('edithint').style.left=400;
        document.getElementById('edithint').style.top=document.body.scrollTop+450;
        document.getElementById('edithint').style.visibility="visible";
        document.getElementById('edithint').innerHTML='<center>'+waitmessage+'<br><img src="http://'+sitename+'/pictures/loading.gif"></center>';
      }
    le=errormessage;
    cmd=md;
    cmdf=mdFunc;
    SendRequest(Url,PostInfo,ReceiveFromTo);
  }
  else
    alert('Элемент "'+element+'" не существует.');
}

function ReceiveFromTo(Response)
{
  if (lvs)
  {
    if (Response=='<na>')
      lvs.innerHTML=le;
    else
    {
      lvs.innerHTML=Response;
      lvs.style.visibility="visible";
      if (cmd>=1)
      {
        cmd=0;
        if (cmdf)
          cmdf();
      }
    }
  }
  else
    document.getElementById('edithint').style.visibility="hidden";
}

function SendRequest(Url,PostInfo,ReceiveFunc)
{
  if (loading == 1)
    alert('Не торописько, уже чего-то там ждём с сервера.');
  else
  {
    rr=ReceiveFunc;
    if (window.XMLHttpRequest)
      req = new XMLHttpRequest();
    else if (window.ActiveXObject)
      req = new ActiveXObject("Microsoft.XMLHTTP");
    req.onreadystatechange = GetInfo;
    req.open("POST", Url, true);
    if (PostInfo)
    {
      req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//      req.setRequestHeader("Content-length", PostInfo.length);
//      req.setRequestHeader("Connection", "close");
      req.send(PostInfo);
    }
    else if (window.XMLHttpRequest)
      req.send(null);
    else if (window.ActiveXObject)
      req.send();
    loading = 1;
  }
}