UPDATE table atraves de textarea

<?php
$resDB = mysql_connect("xxx", "xxx", "xxx");
mysql_select_db("xxx", $resDB);

require_once "cuteeditor_files/include_CuteEditor.php";

$page = $_GET['page'];

if(!empty($page)){
	if (mysql_num_rows(mysql_query("SELECT id FROM pages WHERE id = '$page'"))){
		$resCheck = mysql_query("SELECT * FROM pages WHERE id = '$page'");
		$arrCheck = mysql_fetch_assoc($resCheck);
		$titulo = $arrCheck['titulo'];
		$corpo = $arrCheck['corpo'];
		echo $header;
		echo $top;
		echo ("<form method=\"post\" action=\"admin.php?page=update\">\n");
		echo ("<div class=\"centerDiv\">\n");
		echo ("<input type=\"hidden\" name=\"id\" value=\"$page\">\n");
		echo ("<input type=\"text\" style=\"width: 450px;\" name=\"titulo\" value=\"$titulo\">\n");
		echo ("</div>\n");
		echo ("<div class=\"centerDiv\">\n");
		$editor=new CuteEditor();
		$editor->Text="$corpo";
		$editor->FilesPath="cuteeditor_files";
		$editor->ID="Editor1";
		$editor->Draw();
		echo ("</div>\n");
		echo ("<div class=\"centerDiv\"><input class=\"noBorder\" type=\"submit\" name=\"submit\" value=\"Guardar\" /></div>\n");
		echo ("</form>\n");
		echo $bottom;
		exit;
	}else{
		header('Location: admin.php');
		exit;
	}
}

if($page == 'update') {
	$id = $_POST['id'];
	$titulo = $_POST['titulo'];
	$corpo = $_POST['Editor1'];
	mysql_query("UPDATE pages SET titulo = $titulo, corpo= $corpo WHERE id = $id");
}
?>

<?php
ini_set("display_errors", TRUE);
$resDB = mysql_connect("xxx", "xxx", "xxx");
mysql_select_db("xxx", $resDB);

require_once "cuteeditor_files/include_CuteEditor.php";

if(!empty($page)){
$page = $_GET['page'];
//Se atribuido Update faz actualização
if($page == 'update') {
    $id = $_POST['id'];
    $titulo = $_POST['titulo'];
    $corpo = $_POST['Editor1'];
    mysql_query("UPDATE pages SET titulo='$titulo', corpo='$corpo' WHERE id = $id") or die(mysql_error());
}
//Se não mostra o formulario de actualizacao
else {

    if (mysql_num_rows(mysql_query("SELECT id FROM pages WHERE id='$page'"))){
        $resCheck = mysql_query("SELECT * FROM pages WHERE id='$page'");
        $arrCheck = mysql_fetch_assoc($resCheck);
        $titulo = $arrCheck['titulo'];
        $corpo = $arrCheck['corpo'];
        echo $header;
        echo $top;
        echo ("<form method=\"post\" action=\"admin.php?page=update\">\n");
        echo ("<div class=\"centerDiv\">\n");
        echo ("<input type=\"hidden\" name=\"id\" value=\"$page\">\n");
        echo ("<input type=\"text\" style=\"width: 450px;\" name=\"titulo\" value=\"$titulo\">\n");
        echo ("</div>\n");
        echo ("<div class=\"centerDiv\">\n");
        $editor=new CuteEditor();
        $editor->Text="$corpo";
        $editor->FilesPath="cuteeditor_files";
        $editor->ID="Editor1";
        $editor->Draw();
        echo ("</div>\n");
        echo ("<div class=\"centerDiv\"><input class=\"noBorder\" type=\"submit\" name=\"submit\" value=\"Guardar\" /></div>\n");
        echo ("</form>\n");
        echo $bottom;
        exit;
    }else{
        header('Location: admin.php');
        exit;
    }
  }
}
?>