Ho risolto così, però se volessi collegarmi con l'id ai css?
Codice PHP:
<form action='home.php' method='POST' id='box15' name='formcom'>
[img]comment.png[/img]
<input type='hidden' name='idsp' value='$idsp'>
<input type='hidden' name='idup' value='$idup'>
</form>
</div>
<form action='home.php' method='POST' id='$idsp'
style='width: 300; height: 10; margin: 0 auto 20 auto; padding: 0; display: none;'>
<textarea id='textarea2' class='t' name='commento' maxlength='500'></textarea>
<input type='submit' id='ico6' name='com' value=''>
<input type='hidden' name='idsp' value='$idsp'>
<input type='hidden' name='idup' value='$idup'>
</form>