//extract filename from url
    //eg:
    //http://g-ecx.images-amazon.com/images/G/01/kindle/dp/2012/KC/KC-slate-01-lg._V401028090_.jpg
    //KC-slate-01-lg._V401028090_.jpg
    //file:///C:/Users/CLi/AppData/Local/Temp/WindowsLiveWriter-1737927945/supfilesC19F10/now-the-service-status-is-active_thu%5B1%5D.png
    //now-the-service-status-is-active_thu%5B1%5D.png
    public string extractFilenameFromUrl(string fullUrl)
    {
        string filename = "";
        string[] slashList = fullUrl.Split('/');
        filename = slashList[slashList.Length - 1];
        return filename;
    }

    

    string imageUrl = imageUrlList[idx];
    gLogger.Info(String.Format("[{0}]={1}", idx, imageUrl));

    string picFilename = crl.extractFilenameFromUrl(imageUrl);