function misc_repair_utf8(s)
{
  if (s.charCodeAt(0) == 0xfeff) {
    return s.substr(1);
  }
  if (s.charCodeAt(0) == 0xef && s.charCodeAt(1) == 0xbb && s.charCodeAt(2) == 0xbf) {
    return misc_decode_utf8(s.substr(3));
  }
  return s;
}

function byId(id) {
  if (document.getElementById)
    var returnVar = document.getElementById(id);
  else if (document.all)
    var returnVar = document.all[id];
  else if (document.layers)
    var returnVar = document.layers[id];
  return returnVar;
}


function sack(file) {
  this.xmlhttp = null;

  this.resetData = function() {
    this.method = "POST";
    this.queryStringSeparator = "?";
    this.argumentSeparator = "&";
    this.URLString = "";
    this.encodeURIString = true;
    this.execute = false;
    this.element = null;
    this.elementObj = null;
    this.requestFile = file;
    this.vars = new Object();
    this.responseStatus = new Array(2);
  };

  this.resetFunctions = function() {
    this.onLoading = function() { };
    this.onLoaded = function() { };
    this.onInteractive = function() { };
    this.onCompletion = function() { };
    this.onError = function() { };
    this.onFail = function() { };
  };

  this.reset = function() {
    this.resetFunctions();
    this.resetData();
  };

  this.createAJAX = function() {
    try {
      this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e1) {
      try {
        this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e2) {
        this.xmlhttp = null;
      }
    }

    if (! this.xmlhttp) {
      if (typeof XMLHttpRequest != "undefined") {
        this.xmlhttp = new XMLHttpRequest();
      } else {
        this.failed = true;
      }
    }
  };

  this.setVar = function(name, value){
    this.vars[name] = Array(value, false);
  };

  this.encVar = function(name, value, returnvars) {
    if (true == returnvars) {
      return Array(encodeURIComponent(name), encodeURIComponent(value));
    } else {
      this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
    }
  }

  this.processURLString = function(string, encode) {
    encoded = encodeURIComponent(this.argumentSeparator);
    regexp = new RegExp(this.argumentSeparator + "|" + encoded);
    varArray = string.split(regexp);
    for (i = 0; i < varArray.length; i++){
      urlVars = varArray[i].split("=");
      if (true == encode){
        this.encVar(urlVars[0], urlVars[1]);
      } else {
        this.setVar(urlVars[0], urlVars[1]);
      }
    }
  }

  this.createURLString = function(urlstring) {
    if (this.encodeURIString && this.URLString.length) {
      this.processURLString(this.URLString, true);
    }

    if (urlstring) {
      if (this.URLString.length) {
        this.URLString += this.argumentSeparator + urlstring;
      } else {
        this.URLString = urlstring;
      }
    }
    
    urlstringtemp = new Array();
    for (key in this.vars) {
      if (false == this.vars[key][1] && true == this.encodeURIString) {
        encoded = this.encVar(key, this.vars[key][0], true);
        delete this.vars[key];
        this.vars[encoded[0]] = Array(encoded[1], true);
        key = encoded[0];
      }

      urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
    }
    if (urlstring){
      this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);      
    } else {
      this.URLString += urlstringtemp.join(this.argumentSeparator);
    }  
  }

  this.runResponse = function() {
    eval(this.response);
  }

  this.runAJAX = function(urlstring, async) {
    if (typeof async == 'undefined' || async == null) async = true;
    
    if (this.failed) {
      this.onFail();
    } else {
      this.createURLString(urlstring);
      if (this.element) {
        this.elementObj = document.getElementById(this.element);
      }
      if (this.xmlhttp) {
        var _this = this;
        if (this.method == "GET") {
          totalurlstring = this.requestFile;
          if(this.URLString.length){
             totalurlstring += this.queryStringSeparator + this.URLString;
          }
          this.xmlhttp.open(this.method, totalurlstring, true);
        } else {
          this.xmlhttp.open(this.method, this.requestFile, async);
          try {
            this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
          } catch (e) { }
        }
        try {
          this.xmlhttp.setRequestHeader('IsAjaxy','very');
        }catch(e){
        }
        
        this.xmlhttp.onreadystatechange = function() {
          switch (_this.xmlhttp.readyState) {
            case 1:
              _this.onLoading();
              break;
            case 2:
              _this.onLoaded();
              break;
            case 3:
              _this.onInteractive();
              break;
            case 4:
              _this.response = misc_repair_utf8(_this.xmlhttp.responseText);
              _this.responseXML = _this.xmlhttp.responseXML;
              _this.responseStatus[0] = _this.xmlhttp.status;
              _this.responseStatus[1] = _this.xmlhttp.statusText;

              if (_this.execute) {
                _this.runResponse();
              }

              if (_this.elementObj) {
                elemNodeName = _this.elementObj.nodeName;
                elemNodeName.toLowerCase();
                if (elemNodeName == "input"
                || elemNodeName == "select"
                || elemNodeName == "option"
                || elemNodeName == "textarea") {
                  _this.elementObj.value = _this.response;
                } else {
                  _this.elementObj.innerHTML = _this.response;
                }
              }
              if (_this.responseStatus[0] == "200") {
                _this.onCompletion();
              } else {
                _this.onError();
              }

              _this.URLString = "";
              break;
          }
        };

        this.xmlhttp.send(this.URLString);
      }
    }
  };

  this.reset();
  this.createAJAX();
}

function AutoRefreshableDiv(div_id,refresh_uri,on_update,interval_seconds){
  var _this=this;
  this.timer = null;
  this.running = 0;
  this.first = true;
  this.updated=function(success){
    if(on_update){
      on_update(div_id,success,_this.first);
    }
    if(success){
      _this.first=false;
    }
  }
  this.refresh=function(force){
    var refresher=new sack(refresh_uri);
    refresher.onCompletion = function (){
      if(!_this.running&&!force){
        return;
      }
      byId(div_id).innerHTML=this.response;
      _this.updated(true);
    }
    refresher.onFail=refresher.onError=function(){
      if(!_this.running&&!force){
        return;
      }
      _this.updated(false);
    }
    refresher.method="GET";
    refresher.runAJAX();
  }
  this.start=function(){
    if(!_this.running++){
      _this.timer=window.setInterval(function(){_this.refresh();},interval_seconds*1000);
    }
  }
  this.stop=function(){
    if(!--_this.running){
      window.clearInterval(_this.timer);
    }
  }
}
var auto_refreshable_divs=[];