Here you go!
if you go to /include/client/open.inc.php and go to line 86
CUT(not copy) line 86 to 97 and move it to where you want it, but make sure you paste it AFTER (MAKE SURE AFTER) a of another field.
You shouldn't move it down the list because there is only attachments and captcha text. Move it UP only.
Hope this helps. Let me know if not.
your priority code should only be like this
<td>Priority:</td>
<td>
<select name="pri">
<?
$info=$info?$info:$cfg->getDefaultPriorityId(); //use system's default priority.
while($row=db_fetch_array($priorities)){ ?>
<option value="<?=$row?>" <?=$info==$row?'selected':''?> ><?=$row?></option>
<?}?>
</select>
</td>
</tr>