/*function json_form(chaine,urlservice)
  {
  if(window.XMLHttpRequest){ // Firefox 
  p= new XMLHttpRequest(); 
  p.onload = null;
  }
  else if(window.ActiveXObject) // Internet Explorer 
  p = new ActiveXObject("Microsoft.XMLHTTP"); 
  else { // XMLHttpRequest non supporté par le navigateur 
  alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
  return; 
  } 
  p.open("POST",urlservice, false);
  p.setRequestHeader("Content-type","application/x-www-form-urlencoded");
  p.send(chaine);
  status = p.status;
  if ( status != "200" ) {
  alert("arg ! mauvaise réponse http ("+ status +")");
  } else {
  var donnees =eval('('+p.responseText+')');
  return donnees;
  }
  return null;
  }
 */
function json_form( chaine, urlservice ) {

    var xmlhttp = false;

    /* Compilation conditionnelle d'IE */
    /*@cc_on 
      @if (@_jscript_version >= 5)
      try
      {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch (e)
      {
      try
      {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (E)
      {
      xmlhttp = false;
      }
      }
      @else
      xmlhttp = false;
      @end 
      @*/

    /* on essaie de créer l'objet si ce n'est pas déjà fait */
    if ( !xmlhttp && typeof XMLHttpRequest != 'undefined') {
        try {
            xmlhttp = new XMLHttpRequest();
        }
        catch (e) {
            xmlhttp = false;
        }
    }

    xmlhttp.open("POST",urlservice, false);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    xmlhttp.send(chaine);


    if ( xmlhttp )
        if ( xmlhttp.status != 200) /* 200 : code HTTP pour OK */
            return false;
        else 
            return eval( '('+ xmlhttp.responseText +')' ); 

    return null;
}



function base64Encode(str)
{
    var charBase64 = new Array(
            'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
            'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
            'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
            'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
            );

    var out = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    var len = str.length;

    do
    {
        chr1 = str.charCodeAt(i++);
        chr2 = str.charCodeAt(i++);
        chr3 = str.charCodeAt(i++);

        //enc1 = (chr1 & 0xFC) >> 2;
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 0x03) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 0x0F) << 2) | (chr3 >> 6);
        enc4 = chr3 & 0x3F;

        out += charBase64[enc1] + charBase64[enc2];

        if (isNaN(chr2))
        {
            out += '==';
        }
        else if (isNaN(chr3))
        {
            out += charBase64[enc3] + '=';
        }
        else
        {
            out += charBase64[enc3] + charBase64[enc4];
        }
    }
    while (i < len);

    return out;
}


function base64Decode(str)
{
    var indexBase64 = new Array(
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
            52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
            -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
            15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
            -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
            41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
            -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
            );

    var out = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    // trim invalid characters in the beginning and in the end of the string

    str = str.replace(/^[^a-zA-Z0-9\+\/\=]+|[^a-zA-Z0-9\+\/\=]+$/g,"")

        var len = str.length;

    do
    {
        enc1 = indexBase64[str.charCodeAt(i++)];
        enc2 = indexBase64[str.charCodeAt(i++)];
        enc3 = indexBase64[str.charCodeAt(i++)];
        enc4 = indexBase64[str.charCodeAt(i++)];

        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;

        out += String.fromCharCode(chr1);

        if (enc3 != -1)
        {
            out += String.fromCharCode(chr2);
        }
        if (enc4 != -1)
        {
            out += String.fromCharCode(chr3);
        }
    }
    while (i < len);

    if (i != len)
    {
        new Error(BASE64_BROKEN);
        return "";
    }

    return out;
}