var JSON = {
    copyright: '(c)2005 JSON.org',
    license: 'http://www.crockford.com/JSON/license.html',
/*
    Stringify a JavaScript value, producing a JSON text.
*/
    stringify: function (v) {
        var a = [];

/*
    Emit a string.
*/
        function e(s) {
            a[a.length] = s;
        }

/*
    Convert a value.
*/
        function g(x) {
            var c, i, l, v;

            switch (typeof x) {
            case 'object':
                if (x) {
                    if (x instanceof Array) {
                        e('[');
                        l = a.length;
                        for (i = 0; i < x.length; i += 1) {
                            v = x[i];
                            if (typeof v != 'undefined' &&
                                    typeof v != 'function') {
                                if (l < a.length) {
                                    e(',');
                                }
                                g(v);
                            }
                        }
                        e(']');
                        return;
                    } else if (typeof x.toString != 'undefined') {
                        e('{');
                        l = a.length;
                        for (i in x) {
                            v = x[i];
                            if (x.hasOwnProperty(i) &&
                                    typeof v != 'undefined' &&
                                    typeof v != 'function') {
                                if (l < a.length) {
                                    e(',');
                                }
                                g(i);
                                e(':');
                                g(v);
                            }
                        }
                        return e('}');
                    }
                }
                e('null');
                return;
            case 'number':
                e(isFinite(x) ? +x : 'null');
                return;
            case 'string':
                l = x.length;
                e('"');
                for (i = 0; i < l; i += 1) {
                    c = x.charAt(i);
                    if (c >= ' ') {
                        if (c == '\\' || c == '"') {
                            e('\\');
                        }
                        e(c);
                    } else {
                        switch (c) {
                        case '\b':
                            e('\\b');
                            break;
                        case '\f':
                            e('\\f');
                            break;
                        case '\n':
                            e('\\n');
                            break;
                        case '\r':
                            e('\\r');
                            break;
                        case '\t':
                            e('\\t');
                            break;
                        default:
                            c = c.charCodeAt();
                            e('\\u00' + Math.floor(c / 16).toString(16) +
                                (c % 16).toString(16));
                        }
                    }
                }
                e('"');
                return;
            case 'boolean':
                e(String(x));
                return;
            default:
                e('null');
                return;
            }
        }
        g(v);
        return a.join('');
    },
/*
    Parse a JSON text, producing a JavaScript value.
*/
    parse: function (text) {
        return (/^(\s+|[,:{}\[\]]|"(\\["\\\/bfnrtu]|[^\x00-\x1f"\\]+)*"|-?\d+(\.\d*)?([eE][+-]?\d+)?|true|false|null)+$/.test(text)) &&
            eval('(' + text + ')');
    }
};


// client-side agent implementation 

function Agent() {
  this.debug = false; // default
  this.call = function () {
    var aa_sfunc = "";
    var aa_cfunc = "";
    var result = "";
    var xmlHttpObject;
    if(arguments.length<3) {
      alert("Incorrect number of parameters. Please check your function call");
      return;
    } 
    aa_url=arguments[0];
    aa_sfunc=arguments[1];
    aa_cfunc=arguments[2];

    if((aa_url==null)||(aa_url=="")) aa_url = this_url;
    var aa_poststr = "aa_afunc=call&aa_sfunc=" + encodeURI(aa_sfunc) +
        "&aa_cfunc=" + encodeURI(aa_cfunc);
    for(var i=3; i<arguments.length; i++) {
      if(typeof(arguments[i])=='object') {
        aa_poststr += "&aa_sfunc_args[]="+encodeURI(JSON.stringify(arguments[i]));
      } else {
        aa_poststr += "&aa_sfunc_args[]="+encodeURI(arguments[i]);
      }
    }
    xmlHttpObject = false;
    if (window.XMLHttpRequest) { // Mozilla, Safari,...
       xmlHttpObject = new XMLHttpRequest();
       if (xmlHttpObject.overrideMimeType) {
          xmlHttpObject.overrideMimeType('text/xml');
       }
    } else if (window.ActiveXObject) { // IE
       try {
          xmlHttpObject = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
          try {
             xmlHttpObject = new ActiveXObject("Microsoft.XMLHTTP");
          } catch (e) {}
       }
    }
    if (!xmlHttpObject) {
       alert('Agent unable to establish communication  :( ');
       return false;
    }
    
    if((aa_sfunc==null)||(aa_sfunc=="")) {
      if(arguments[3]) aa_poststr=arguments[3];
    }
    
    if((aa_cfunc==null)||(aa_cfunc=="")) {
      xmlHttpObject.open('POST', aa_url, false);
      xmlHttpObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      xmlHttpObject.setRequestHeader("Content-length", arguments.length+1);
      //xmlHttpObject.setRequestHeader("Connection", "close"); // not needed
      xmlHttpObject.send(aa_poststr);
      return xmlHttpObject.responseText;
    } else {
      xmlHttpObject.onreadystatechange = function () {
        if (xmlHttpObject.readyState == 4) {
           if (xmlHttpObject.status == 200) {
              result = xmlHttpObject.responseText;
              result = result.replace(/\\\"/g,'"');
              if(document.getElementById(aa_cfunc)) {
                try {
                  document.getElementById(aa_cfunc).innerHTML=result;
                }
                catch (e) {
                  document.getElementById(aa_cfunc).value=result;
                }               
              } else {
                if (JSON.parse(result)) 
                  eval(aa_cfunc+"(JSON.parse(result));");
                else 
                  eval(aa_cfunc+"(result);");
              }
           } else {
              if(xmlHttpObject.status!=0) {
                //alert('There was a problem with the request.');
              }
           }
        }
      }
      xmlHttpObject.open('POST', aa_url, true);
      xmlHttpObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      xmlHttpObject.setRequestHeader("Content-length", arguments.length+1);
      //xmlHttpObject.setRequestHeader("Connection", "close"); // not needed
      xmlHttpObject.send(aa_poststr);
      return xmlHttpObject;
    }
  }
  this.listen = function (aa_event, aa_cfunc) {
    // listener function will come here
  }
}
var agent = new Agent();