problema riconoscimento ip tra form e database diversi

//connessione e invio al DB
$connessione = mysql_connect($host, $username, $password) or die("Connessione DB fallita");
mysql_select_db($database, $connessione) or die("Selezione DB fallita");

//visualizza tutti i record nel DB
$query_forum = "SELECT * FROM $tabella_forum Order By id DESC LIMIT 20";
$result_forum = mysql_query($query_forum, $connessione) or die('Errore caricamento forum forumeggio...');

//funzione per visualizzare gli accenti
function my_htmlspecialchars($var)
{
    $search = array('è', 'é', 'ì', 'ù', 'ò', 'à');
    $replace = array('è', 'é', 'ì', 'ò', 'à');
    $var = str_replace($var, $search, $replace);
    
    return $var;
}  

// Order of replacement
$str     = "Line 1\nLine 2\rLine 3\r\nLine 4\n";
$order   = array("\r\n", "\n", "\r");
$replace = '<br />';

$newstr = str_replace($order, $replace, $str);

//ciclo while per visualizzare i dati estratti dal database
while($resrow_forum = mysql_fetch_row($result_forum))
{
$id_forum = $resrow_forum[0];
$nome_forum = addslashes($resrow_forum[1]);
$titolo_forum = addslashes($resrow_forum[2]);
$commento_forum = ($resrow_forum[3]);
$data_forum = addslashes($resrow_forum[4]);

//Stampo il risultato
echo "
<div class='divcommenti' align='center'>
	<table class='tablecommenti' cellpadding=0 cellspacing=0>
		<tr>
			<td class='idx'>$id_forum</td>
			<td class='col1comm' >$titolo_forum</td>
			<td class='col5comm'>$data_forum</td>
		</tr>
		<tr>
			<td class='idx2'>&nbsp </td>
			<td class='col3comm' colspan=2>
				<font class='col2comm'>$nome_forum:</font> $commento_forum</td>
		</tr>";
		
//seleziono i commenti dal DB
$query_forum_comm = "SELECT * FROM $tabella_forum_comm Order By idc_z DESC";
$result_forum_comm = mysql_query($query_forum_comm, $connessione) or die('Errore caricamento commenti per forum forumeggio...');

//ciclo while per visualizzare i dati estratti dal database
while($resrow_forum_comm = mysql_fetch_row($result_forum_comm))
{
$id_forum_comm = $resrow_forum_comm[0];
$nome_forum_comm = addslashes($resrow_forum_comm[1]);
$commento_forum_comm = ($resrow_forum_comm[2]);
$data_forum_comm = addslashes($resrow_forum_comm[3]);
$id_forum_ris = addslashes($resrow_forum_comm[4]);

//riconoscimento dei commenti di un post tramite id
if ($id_forum_ris == $id_forum) {

//Stampo il risultato (verificato OK)
echo"	
		<tr>
			<td class='idx2'>&nbsp </td>
			<td class='col8comm' colspan=2><br>RE: <font class='col7comm'>$nome_forum_comm:</font> $commento_forum_comm</td>
		</tr>
		<tr>
			<td class='idx2'>&nbsp </td>
			<td class='col6comm' colspan=2>$data_forum_comm</td>
		</tr>	";
	}
}

echo"
		<tr>
			<td class='idx2'>&nbsp </td>
			<td colspan='2' class='col4comm'>
			
					<div class='outer-container'>
						<div class='button-container'><span>Inserisci un commento</span></div>
						<div class='closed'>
						
						<form method='post' action='forum/forumeggio/commenti_ins2.php'>			
							<table>
								<tr>
									<td><div style='font-size:12px'>Nome:</div></td>
									<td>
										<input class='commentabox2' type='text' name='nome_forum_c'>
									</td>
									<td>
										<input class='commentabox3' disabled='disabled'  type='text' name='data_forum_c' readonly='readonly' 
											value='"; echo date("d/m/y"),' ',ora,' ',date("H:i"); echo"'>
									</td>
									<td>
										<input class='commentabox4' disabled='disabled'  type='text' name='id_forum' readonly='readonly' value='$id_forum_ris'>
									</td>
								</tr>
								<tr>
									<td colspan=4>
										<textarea class='commentabox1' name='commento_forum_c' wrap='hard'></textarea>
									</td>
								</tr>
								<tr>
									<td colspan=4>
										<input type='submit'value='Invia commento' name='action'>
										<input type='reset' value='Cancella'>
									</td>								
								</tr>	
							</table>
						</form>

						</div>
					</div>
					
			</td>
		</tr>

</div>
";	
}
echo"
		<tr>
			<td colspan='3' class='col5comm'>leggi tutti i post</td>
		</tr>
	</table>
";