function BackgroundFileWork(
    hostName, 
    port, 
    downloadComplete,
    uploadComplete,
    downloadProgress,
    uploadProgress) 
{
    this.HostName = hostName;
    this.Port = port;
      
    var objDownload = null;
    var objUpload = null;
    
    this.Init = function() 
    {
        try
	    {
	        var comObj1 = document.createElement("object");
            comObj1 = document.createAttribute("classid","clsid:DE6D2D41-6A36-4624-A0A4-AD587FCF10DC");
        
            var comObj2 = document.createElement("object");
            comObj2 = document.createAttribute("classid","clsid:B055E7B6-06F0-4726-A0E5-C32773E635A7");
            
            objDownload = new ActiveXObject("FileWork.DownloadControl");
            objUpload = new ActiveXObject("ChilkatUpload.ChilkatUpload");
            
            if(!objDownload.ValidateWorkDirectory())
                objDownload.SetDefaultWorkDirectory();

	    }
        catch(e)
	    {
		    alert(e.description);
		    return false;
	    }
        return true;
    };
    
    this.SetWorkDirectory = function() 
    {
        objDownload.SetWorkDirectory();
     };
    
    function timerDownload(obj)
    {
        var prcnt = 0 ;
        var timeOut = setTimeout(function() {timerDownload(obj);},  1000 );
        
        if(objDownload.ProgressMax!= 0 )
		    prcnt = Math.round(objDownload.Progress/objDownload.ProgressMax)* 100 
        
        obj.DownloadProgress(prcnt);
	    if(objDownload.UploadComplete) 
	    {
		    clearTimeout(timeOut);
		    
		    obj.DownloadComplete(prcnt);    		
		    return;
	    }
    }

    function timerUpload(obj)
    {
        var timeOut = setTimeout(function() {timerUpload(obj);},  1000 );
        obj.UploadProgress(objUpload.PercentUploaded);
	    
	    if(objUpload.UploadSuccess) 
	    {
		    clearTimeout(timeOut);
		    obj.UploadComplete(objUpload.PercentUploaded);
		    return;
	    }
    }
    
    this.UrlDownloadToFile = function(pathFileServer, clientFileName) 
    {
        try
        {
            objDownload.UrlDownloadToFile(this.HostName+":"+this.Port+"/"+pathFileServer, objDownload.WorkDirectory+"\\"+clientFileName);
            
            timerDownload(this);
            
        }
	    catch(e)
	    {
		    alert(e.description);
		    return false;
	    }
    };
    
    this.UrlUpload = function(pageUploadPath) 
    {
        try
        {
            objUpload.Hostname=this.HostName;
            objUpload.Path="/"+pageUploadPath;
            objUpload.Port=this.Port;
            objUpload.AddFileReference(objDownload.LastDownloadFileName, objDownload.LastDownloadFileName);
            objUpload.BeginUpload();
            
            timerUpload(this);
            
        }
	    catch(e)
	    {
		    alert(e.description);
		    return false;
	    }
    };
    
    this.ExecuteDownLoadFile = function() 
    {
        try
        {
            objDownload.ExecuteDownLoadFile();
            
        }
	    catch(e)
	    {
		    alert(e.description);
		    return false;
	    }
    };
    
    this.DownloadComplete = downloadComplete;
    
    this.UploadComplete = uploadComplete;
    
    this.DownloadProgress = downloadProgress;
    
    this.UploadProgress = uploadProgress;
}