Image url firefox vs explorer

Kode 

// Initialize variables

        string sSavePath;
        string sThumbExtension;


        // Set constant values

        sSavePath = "images/";
        sThumbExtension = "_thumb";


        if (FileUpload.PostedFile != null)
        {
            // Check file size (mustn’t be 0)

            HttpPostedFile myFile = FileUpload.PostedFile;
            int nFileLen = myFile.ContentLength;
            if (nFileLen == 0)
            {
                lblOutput.Text = "No file was uploaded.";
                return;
            }

            if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".jpg")
            {
                lblOutput.Text = "The file must have an extension of JPG";
                return;
            }

            // Read file into a data stream

            byte[] myData = new Byte[nFileLen];
            myFile.InputStream.Read(myData, 0, nFileLen);

            // Make sure a duplicate file doesn’t exist.  If it does, keep on appending an 

            // incremental numeric until it is unique

            string sFilename = System.IO.Path.GetFileName(myFile.FileName);
            int file_append = 0;
            while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
            {
                file_append++;
                sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
                                 + file_append.ToString() + ".jpg";
            }

            // Save the stream to disk

            System.IO.FileStream newFile
                    = new System.IO.FileStream(Server.MapPath(sSavePath + sFilename),
                                               System.IO.FileMode.Create);
            newFile.Write(myData, 0, myData.Length);
            newFile.Close();

            // If jpg file is a jpeg, create a thumbnail filename that is unique.

            file_append = 0;
            string sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
                                                     + sThumbExtension + ".jpg";
            while (System.IO.File.Exists(Server.MapPath(sSavePath + sThumbFile)))
            {
                file_append++;
                sThumbFile = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
                               file_append.ToString() + sThumbExtension + ".jpg";
            }