Form with custom Input Button not submitting

[eluser]The Wizard[/eluser]
Hello Friends!

i have a design with a custom submit button.

Code:

<?= form_open('comment/add_comment'); ?>

    <?= form_hidden('data_id', $video['id'] ); ?>
    <?= form_hidden('type', FLAG_VIDEO ); ?>

    <!-- Yorum Yaz-->
    <div id="yorumyaz">
        <h1>Comment on this video</h1>
        <div id="yorumtext">

            &lt;!-- <div class="cavatar"><img src="&lt;?= base_url(); ?&gt;assets/images/avatar.png" /></div> --&gt;

            <div class="feed-uye-img">
                <img src="&lt;?= base_url() . 'media/image/medium/' . $video['owner_id'] .'/'. $video['picture_profile']; ?&gt;" />
            </div>


            <div id="yorum-textarea">
                &lt;textarea id="charcount" class="y-textarea"&gt;&lt;/textarea>
            </div>

            <div class="buttonsabit" id="sagayasla">
                &lt;input class="buttonsabit large" type="submit" name="submit" value="Gönder" /&gt;
            </div>
            
            &lt;!-- <div id="y-karakter">Remaining character count:<span class="yolrakam">500</span></div>                             --&gt;

        </div>

    </div>
    &lt;!-- /Yorum Yaz--&gt;

    <div class="butform">
        &lt;input id="buttonsabit large" type="submit" name="" value="Gönder" /&gt; &lt;!-- THIS DOES NOT WORK !!! --&gt;
    </div>
    
    &lt;?= form_submit('submit', 'Submit' ); ?&gt; //this one works



&lt;?= form_close(); ?&gt;

does anybody have an idea why the input does NOT submit the form?

thanks in advance