مشکل با Undefined index:

سلام.
دوستان من این کد رو برای آپلود عکس نوشتم. تو سمت سرور خطای زیر رو میده:اشتباه: مشکل از کجاست؟؟؟

کد HTML:

Notice: Undefined index: image in C:\xampp\htdocs\dashboard\...\gallery-op.php on line 1



<form method="post" action="gallery-op.php">

    <table>

        <tr><td><input type="file" name="image" accept="image/*"></td></tr>

        <tr><td><input type="submit" value="درج تصویر"></td></tr>

    </table>

</form>



if(is_uploaded_file($_FILES["image"]["tmp_name"])){

        

    $target_dir = "gallery/";

    $target_file = $target_dir . basename($_FILES["image"]["name"]);

    $pictureFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSIO  N));

    $uploadOk = 1;

                

    // Check if image file is a actual image or fake image

    $check = getimagesize($_FILES["image"]["tmp_name"]);

    if($check === false)

        $uploadOk = 0;

                

    // Check file size

    if ($_FILES["image"]["size"] > 500000)

        $uploadOk = 0;

            

    // Allow certain file formats

    if($pictureFileType != "png" && $pictureFileType != "gif" && $pictureFileType != "bmp" && $pictureFileType != "jpg" && $pictureFileType != "jpeg")

        $uploadOk = 0;

            

    // Check if $uploadOk is set to 0 by an error

    if ($uploadOk == 1){

        

        $image = $target_dir.$row["id"].'.'.$pictureFileType;

        move_uploaded_file($_FILES["image"]["tmp_name"], "../".$image);

            

            

        mysql_query("insert into gallery values(null,'$image'",$con);

        header("location:gallery.php?msg=insert");

        

    }

}