Input wont update in db

gistfile1.txt

<?php  include("mysql_open.php");?>
				<?php
                if($_POST['Submit']=="Opdater"){
                $result = mysql_query("UPDATE `fp_text` SET `fp_id`=[value-1],`fp_header`=[value-2],`fp_text`=[value-3] WHERE 1");
                }
                ?>
                <form action="index.php" name="text_edit1" method="post" enctype="multipart/form-data">
                <?php
                $query = mysql_query("SELECT * FROM `fp_text` WHERE 1");
                while($row = mysql_fetch_array($query)){
                ?>
                <div style="font-family: 'PT Sans', sans-serif;">
                Overskrift<br /> <input name="fp_header<?= $row['id'] ?>" type="text" size="64" maxlength="64" value="<?= $row['fp_header'] ?>" /><br />
                <br />
                Beskrivelse af Stutteriet:<br /> <textarea name="fp_text<?= $row['id'] ?>" cols="50" rows="16"><?= $row['fp_text'] ?></textarea><br /><br /><br />
                </div>
                <?php
                }
                ?>
                <input name="Submit" type="submit" id="Submit" value="Opdater" />
                </form>
                <?php mysql_close($db); ?>