function Ajax() {
  this.req = null;
  this.url = null;
  this.status = null;
  this.statusText = '';
  this.method = 'GET';
  this.async = true;
  this.dataPayload = null;
  this.readyState = null;
  this.responseText = null;
  this.responseXML = null;
  this.handleResp = null;
  this.responseFormat = 'text', // 'text', 'xml', 'object'
  this.mimeType = null;
  this.headers = [];

  
  this.init = function() {
    var i = 0;
    var reqTry = [ 
      function() { return new XMLHttpRequest(); },
      function() { return new ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP' )} ];
      
    while (!this.req && (i < reqTry.length)) {
      try { 
        this.req = reqTry[i++]();
      } 
      catch(e) {}
    }
    return true;
  };
  this.doGet = function(url, hand, format) {
    this.url = url;
    this.handleResp = hand;
    this.responseFormat = format || 'text';
    this.doReq();
  };
  this.doPost = function(url, dataPayload, hand, format) {
    this.url = url;
    this.dataPayload = dataPayload;
    this.handleResp = hand;
    this.responseFormat = format || 'text';
    this.method = 'POST';
    this.doReq();
  };
  this.doReq = function() {
    var self = null;
    var req = null;
    var headArr = [];
    
    if (!this.init()) {
      alert('Erreur ! Création de l\'objet XMLHttpRequest impossible !.');
      return;
    }
    req = this.req;
    req.open(this.method, this.url, this.async);
    if (this.method == "POST") {
      this.req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    }
    self = this;
    req.onreadystatechange = function() {
      var resp = null;
      self.readyState = req.readyState;
      if (req.readyState == 4) {
        
        self.status = req.status;
        self.statusText = req.statusText;
        self.responseText = req.responseText;
        self.responseXML = req.responseXML;
        
        switch(self.responseFormat) {
          case 'text':
            resp = self.responseText;
            break;
          case 'xml':
            resp = self.responseXML;
            break;
          case 'object':
            resp = req;
            break;
        }
        
        if (self.status > 199 && self.status < 300) {
          if (!self.handleResp) {
            alert('Pas de réponse reçue du serveur... ' +
              'Réessayez plus tard.');
            return;
          }
          else {
            self.handleResp(resp);
          }
        }
        
        else {
          self.handleErr(resp);
        }
      }
    }
    req.send(this.dataPayload);
  };
  this.abort = function() {
    if (this.req) {
      this.req.onreadystatechange = function() { };
      this.req.abort();
      this.req = null;
    }
  };
  this.handleErr = function() {
    var errorWin;
    // Create new window and display error
    try {
      errorWin = window.open('', 'errorWin');
      errorWin.document.body.innerHTML = this.responseText;
    }
    // If pop-up gets blocked, inform user
    catch(e) {
      alert('Un erreur est apparue, mais le message n\'a pas pu' +
      ' être affiché du fait de votre système bloquant les pop-up intégré à votre navigateur.\n' +
      'Autorisez les pop-ups pour ce site web.');
    }
  };
  this.setMimeType = function(mimeType) {
    this.mimeType = mimeType;
  };
  this.setHandlerResp = function(funcRef) {
    this.handleResp = funcRef;
  };
  this.setHandlerErr = function(funcRef) {
    this.handleErr = funcRef; 
  };
  this.setHandlerBoth = function(funcRef) {
    this.handleResp = funcRef;
    this.handleErr = funcRef;
  };
  this.setRequestHeader = function(headerName, headerValue) {
    this.headers.push(headerName + ': ' + headerValue);
  };
  
}


var hand = function(str){
	window.document.getElementById('response_span').innerHTML=str;
	window.document.getElementById('fieldButton').innerHTML="<input type=\"submit\" id=\"submitButton\" name=\"submitButton\" value=\"Pagerank !\" onclick=\"checkPageRank(url.value)\"/>";
}
function checkPageRank(url){
	var strDomain='';
	window.document.getElementById('response_span').innerHTML="<div class=\"pagerank\"><p align=\"center\"><font color=#40c3f6>Loading...</font></p></div>";
	window.document.getElementById('fieldButton').innerHTML="<img src=load.gif style=\"margin-top: 10px; margin-left: 45px;\">";
	var ajax = new Ajax();
	ajax.doGet(strDomain+'pagerank.php?action=fetchPagerank&url='+url,hand,'text');
}

function include_page(page,id)
{
var texte = '';

var xhr; // on déclare l'instance
if (window.XMLHttpRequest) xhr = new XMLHttpRequest(); // Firefox, Opera, Konqueror, Safari, ...
else if (window.ActiveXObject) xhr = new ActiveXObject('Microsoft.XMLHTTP'); // Internet Explorer
else alert('JavaScript : votre navigateur ne supporte pas les objets XMLHttpRequest... Dommage !'); // Navigateur ancien

xhr.open('POST',page,true);
xhr.onreadystatechange = function()
{
if (xhr.readyState == 4)
{
if (document.getElementById) document.getElementById(id).innerHTML = xhr.responseText;
}
else {//Message affiché pendant le chargement
			document.getElementById(id).innerHTML = "<img src='load2.gif'/>";
		}
}
xhr.setRequestHeader('Content-type','application/x-www-form-urlencoded');
var data = 'texte='+escape(texte);
xhr.send(data);
}