function Asynchronous()
{
    this._xmlhttp = new FactoryXMLHttpRequest();
}
function Asynchronous_post(url,data,control)
{
    var instance = this;
    this._xmlhttp.open('POST',url,true);
    this._xmlhttp.onreadystatechange = function()
    {
        switch(instance._xmlhttp.readyState)
        {    
            case 1:
                instance.loading();
                break;
            case 2:
                instance.loaded(control);
                break;
            case 3:
                instance.interactive();
                break;
            case 4:
                instance.complete(instance._xmlhttp.status,
                                    instance._xmlhttp.statusText,
                                    instance._xmlhttp.responseText,
                                    instance._xmlhttp.responseXML,
                                    control);
                                    
                break;
        }
    }
    
    this._xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    this._xmlhttp.setRequestHeader("Content-length", data.length);
    this._xmlhttp.send(data);
}
function Asynchronous_call(url,control)
{
    var instance = this;
    this._xmlhttp.open('GET',url,true);
    //alert(url);
    this._xmlhttp.onreadystatechange = function()
    {
        switch(instance._xmlhttp.readyState)
        {    
            case 1:
                instance.loading();
                break;
            case 2:
                instance.loaded()
                break;
            case 3:
                instance.interactive();
                break;
            case 4:
                instance.complete(instance._xmlhttp.status,
                                    instance._xmlhttp.statusText,
                                    instance._xmlhttp.responseText,
                                    instance._xmlhttp.responseXML,
                                    control);
                                    
                break;
        }
    }
    this._xmlhttp.send(null);
}
function Asynchronous_loading(){}
function Asynchronous_loaded(){}
function Asynchronous_interactive(){}
function Asynchronous_complete(status,statusText,responseText,responseHTML,control){}

Asynchronous.prototype.loading = Asynchronous_loading;
Asynchronous.prototype.loaded = Asynchronous_loaded;
Asynchronous.prototype.interactive = Asynchronous_interactive;
Asynchronous.prototype.complete =    Asynchronous_complete;

Asynchronous.prototype.call = Asynchronous_call;
Asynchronous.prototype.post = Asynchronous_post;