var xmlHttp = createXmlHttpRequestObject();
var serverAddress = "";
var showErrors = true;
var cache = new Array();
var handleRequestFunc = 0;

function createXmlHttpRequestObject() 
{
  var xmlHttp;
  try
  {
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                    "MSXML2.XMLHTTP.5.0",
                                    "MSXML2.XMLHTTP.4.0",
                                    "MSXML2.XMLHTTP.3.0",
                                    "MSXML2.XMLHTTP",
                                    "Microsoft.XMLHTTP");
    for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) 
    {
      try 
      { 
        xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
      } 
      catch (e) {}
    }
  }
  if (!xmlHttp)
    displayError("Ошибка создания объекта XMLHttpRequest");
  else 
    return xmlHttp;
}


function displayError(message)
{
  if (showErrors)
  {
    showErrors = false;
    alert("Возникла ошибка: \n" + message);
  }
}

// send request was here


function handleRequestStateChange() 
{
  if (xmlHttp.readyState == 4) 
  {
    if (xmlHttp.status == 200) 
    {
      try
      {
////////////////////////////////////////////////////////////
	//alert(handleRequestFunc);
	switch(parseInt(handleRequestFunc))
	{
		case 1:
			setFlagReadResponse();
			break;
		case 2:
			loadComments();
			break;
		case 3:
			loadDescr();
			break;
		case 4:
			updateRequestList();
			break;
		default:
			readResponse();
	}
////////////////////////////////////////////////////////////
      }
      catch(e)
      {
        displayError(e.toString());
      }
    }
    else
    {
      displayError(xmlHttp.statusText);
    }
  }
  else suggestWating();
}

// read response was here

function suggestWating()
{
  setTimeout("handleRequestStateChange()",1000);
}