[HELP] mysql_fetch_assoc ERRORE

[Malestorm]

Dopo avere risolto il problema di post delle news, ora mi si presenta un ulteriore dilemma, ho modificato il mio script per poter modificare o cancellare degli articoli

script:

/* connessione al database */
   $db = mysql_connect ('localhost','.....','..........');
   mysql_select_db ('........',$db);
    
   //-----------------------------------------------------------------------------------------------------------    
   // MODULO INSERIMENTO DELLE NEWS
   //-----------------------------------------------------------------------------------------------------------    
   /* form inserimento news */
   function formInsert() {
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO INSERIMENTO NEWS</span></span>

</TD></TR>\n";
      echo "<TR><TD><FORM action=\"index.php?lng=it&cdx=chk&skip=ok&action=addnews\" method=POST>\n";
      echo "Titolo
<input type=\"text\" " .
         "width=\"30\" name=\"titolo\">
\n";
      echo "
Articolo
<TEXTAREA cols=\"40\" rows=\"10\" " .
         "name=\"articolo\"></TEXTAREA>
\n";
      echo "
<input type=\"submit\" name=\"submit\" " .
         "value=\"Inserisci\"\n";
      echo "</FORM></TD></TR>\n";
      echo "</TABLE>\n";
      }
      
   /* funzione inserimento news */
   function insertNews() {
      global $db;
      
      /* inseriamo la news nella tabella */
      $query = "INSERT INTO news(postdate, title, newstext) VALUES(now(),'$_POST[titolo]','$_POST[articolo]')";
      mysql_query($query)  or die("Query non valida: " . mysql_error());
     
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO INSERIMENTO NEWS</span></span>

</TD></TR>\n";
      echo "<TR><TD>News inserita. Grazie!

\n";
      echo "<a href=\"index.php?lng=it&cdx=chk&skip=ok\">Amministrazione</a></TD></TR>\n";
      echo "</TABLE>\n";
      }
   //-----------------------------------------------------------------------------------------------------------    
   //-----------------------------------------------------------------------------------------------------------    
    
   //-----------------------------------------------------------------------------------------------------------
   // MODULO CANCELLAZIONE NEWS E ARTICOLI    
   //-----------------------------------------------------------------------------------------------------------      
   /* funzione cancella news */
   function deleteNews($item) {
      global $db;
      
      /* cancello la news nella tabella e i commenti */
      mysql_query ("DELETE FROM news WHERE id = '$_POST[item]'") or die ( "Non riesco ad eseguire la richiesta");
      mysql_query ("DELETE FROM news_comments WHERE news_id = '$_POST[item]'") or die ( "Non riesco ad eseguire la richiesta"); 
     
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO ELIMINAZIONE NEWS</span></span>

</TD></TR>\n";
      echo "<TR><TD>News e commenti cancellati. Grazie!

\n";
      echo "<a href=\"index.php?lng=it&cdx=chk&skip=ok\">Amministrazione</a></TD></TR>\n";
      echo "</TABLE>\n";
      }    
      
      /* form cancella news */
   function formDelete() {
      global $db;
      
      /* recupero le news */
      $query = "SELECT *" . 
               "DATE_FORMAT(postdate, '%d-%m-%Y') as date " .
               "FROM news ORDER BY postdate DESC";
      $result = mysql_query ($query);
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD>Commenti:</TD></TR>\n";
      echo "</TABLE>\n";
      echo "
\n";
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO ELIMINAZIONE NEWS</span></span>

</TD></TR>\n";
    
      /* visualizzo form selezione */
      while ($row = mysql_fetch_assoc ($result)) {
        $id = $row['id'];
        $titolo = htmlentities ($row['title']);
        $data = $row['date'];
        echo "<TR><TD><FORM action=\"index.php?lng=it&cdx=chk&skip=ok&action=delnews\" method=POST>\n";
        echo "<input type=hidden name=\"item\" value=\"'.$id.'\">[b]$titolo[/b] $data</TD><TD><input type=\"submit\" name=\"submit\" value=\"Cancella\"</TD>\n";
        echo "</FORM></TD></TR>\n";
        }
      echo "</TD></TR></TABLE>\n";
      }    
   //-----------------------------------------------------------------------------------------------------------    
   //-----------------------------------------------------------------------------------------------------------
   
   //-----------------------------------------------------------------------------------------------------------    
   // MODULO MODIFICA NEWS
   //-----------------------------------------------------------------------------------------------------------
   /* form selezione news */
   function selectEdit() {
      global $db;
   /* recupero le news */
   $query = "SELECT *" . 
            "DATE_FORMAT(postdate, '%d-%m-%Y') as date " .
            "FROM news ORDER BY postdate DESC";
    $result = mysql_query ($query);
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD>Commenti:</TD></TR>\n";
      echo "</TABLE>\n";
      echo "
\n";
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO MODIFICA NEWS</span></span>

</TD></TR>\n";
                
      /* visualizzo form selezione */
      while ($row = mysql_fetch_assoc ($result)) {
        $id = $row['id'];
        $titolo = htmlentities ($row['title']);
        $data = $row['date'];
        echo "<TR><TD><FORM action=\"index.php?lng=it&cdx=chk&skip=ok&action=formEdit\" method=POST>\n";
        echo "<input type=hidden name=\"item\" value=\"'.$id.'\">[b]$titolo[/b] $data</TD><TD><input type=\"submit\" name=\"submit\" value=\"Cancella\"</TD>\n";
        echo "</FORM></TD></TR>\n";
        }
      echo "</TD></TR></TABLE>\n";
      }    
      
   /* form modifica news */
   function formEdit($item) {
      global $db;
   /* recupero le news */
   $query = "SELECT *" . 
            "FROM news WHERE id = '$_POST[item]'";
    $result = mysql_query ($query);
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD>Commenti:</TD></TR>\n";
      echo "</TABLE>\n";
      echo "
\n";
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO MODIFICA NEWS</span></span>

</TD></TR>\n";
                
      /* visualizzo form selezione */
      while ($row = mysql_fetch_assoc ($result)) {
        $id = $row['id'];
        $titolo = htmlentities ($row['title']);
        $articolo = nl2br ($row['newstext']);        
        echo "<TR><TD><FORM action=\"index.php?lng=it&cdx=chk&skip=ok&action=upnews\" method=POST>\n";
        echo "Titolo
<input type=\"text\" " .
         "width=\"30\" name=\"titolo\" value=\"'.$titolo.'\">
\n";
        echo "
Articolo
<TEXTAREA cols=\"40\" rows=\"10\" " .
         "name=\"articolo\" value=\"'.$articolo.'\"></TEXTAREA>
\n";
        echo "
<input type=\"submit\" name=\"submit\" " .
         "value=\"Inserisci\"\n";
        echo "<input type=hidden name=\"item\" value=\"'.$id.'\">\n";
        echo "</FORM></TD></TR>\n";        
        }
      echo "</TD></TR></TABLE>\n";
      }    
   
   /* funzione edita news */
   function editNews($item) {
      global $db;
      
      /* aggiorniamo la news nella tabella */
      mysql_query("UPDATE news SET newstext = '$_POST[articolo]' WHERE id = '$_POST[item]'") or die ( "Non riesco ad eseguire la richiesta"); 
      mysql_query("UPDATE news SET title = '$_POST[titolo]' WHERE id = '$_POST[item]'") or die ( "Non riesco ad eseguire la richiesta");
      
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO INSERIMENTO NEWS</span></span>

</TD></TR>\n";
      echo "<TR><TD>News modificata. Grazie!

\n";
      echo "<a href=\"index.php?lng=it&cdx=chk&skip=ok\">Amministrazione</a></TD></TR>\n";
      echo "</TABLE>\n";
      }
   //-----------------------------------------------------------------------------------------------------------    
   //-----------------------------------------------------------------------------------------------------------
   
   /* funzione start */
   function manageNews() {
      
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO GESTIONE NEWS</span></span>

</TD></TR>\n";
      echo "<TR><TD><a href=\"index.php?lng=it&cdx=chk&skip=ok&action=formInsert\">Inserisci News</a>
<a href=\"index.php?lng=it&cdx=chk&skip=ok&action=selectEdit\">Modifica News</a>
<a href=\"index.php?lng=it&cdx=chk&skip=ok&action=formDelete\">Cancella News</a></TD></TR>\n";
      echo "</TABLE>\n";
      }
   
   //-----------------------------------------------------------------------------------------------------------    
   /* questa è la parte dello script dove viene presa la decisione di che cosa fare */
   //-----------------------------------------------------------------------------------------------------------
   echo "<CENTER>\n";
   switch($_GET['action']) {
    
        /* moduli inserimento news */
       case 'addnews':
            insertNews();
            break;
       case 'formInsert':
            formInsert();
            break;
       /* moduli modifica news */
       case 'upnews':
            editNews($_GET['item']);
            break;
       case 'selectEdit':
            selectEdit();
            break;
       case 'formEdit':
            formEdit($_GET['item']);
            break;
       /* moduli cancella news */   
       case 'delnews':
            deleteNews($_GET['item']);
            break;
       case 'formDelete':
            formDelete();
            break;
       default:
              manageNews();
      }
   echo "</CENTER>\n";
   //-----------------------------------------------------------------------------------------------------------
   //-----------------------------------------------------------------------------------------------------------
   } 

Quando dalla pagina iniziale manageNews vado a selezionare il link modifica o cancella
mi arriva l'errore:

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /home/ftp-ataca/torinofreetime.com/index.php on line ...

in entrambi i casi corrispondono alle righe:

while ($row = mysql_fetch_assoc ($result)) { 

dei moduli modifica e cancellazione nelle funzioni selectEdit e formDelete.

Avrei cortesemente bisogno di capire nel mio script dove è l'errore, piu precisamente qui:

/* form cancella news */
   function formDelete() {
      global $db;
      
      /* recupero le news */
      $query = "SELECT *" . 
               "DATE_FORMAT(postdate, '%d-%m-%Y') as date " .
               "FROM news ORDER BY postdate DESC";
      $result = mysql_query ($query);
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD>Commenti:</TD></TR>\n";
      echo "</TABLE>\n";
      echo "
\n";
      echo "<TABLE border=\"0\" width=\"100%\">\n";
      echo "<TR><TD><span class=\"Stile2\">MODULO ELIMINAZIONE NEWS</span></span>

</TD></TR>\n";
    
      /* visualizzo form selezione */
      while ($row = mysql_fetch_assoc ($result)) {
        $id = $row['id'];
        $titolo = htmlentities ($row['title']);
        $data = $row['date'];
        echo "<TR><TD><FORM action=\"index.php?lng=it&cdx=chk&skip=ok&action=delnews\" method=POST>\n";
        echo "<input type=hidden name=\"item\" value=\"'.$id.'\">[b]$titolo[/b] $data</TD><TD><input type=\"submit\" name=\"submit\" value=\"Cancella\"</TD>\n";
        echo "</FORM></TD></TR>\n";
        }
      echo "</TD></TR></TABLE>\n";
      }