Ecco il codice..
codice:
<html>
        <head>
        <title>Donation</title>
        </head>
        
        <script> 
        window.onload = function() { 
            document.getElementById('positivo').disabled = true;             
        } 
        </script>
        
        <body>
               







               <table align='center'>
                <form method=POST action='processes2.php'> 
                        <?php
                            include ('connection.php');
                            
                            session_start();
                            $n_items=$_SESSION['n_items'];
                            
                            for ($n = 1; $n <=$n_items ; ++$n)
                            {
                                echo ("<tr>");
                                echo ("<td>");
                                echo ("<h3>Item ".$n."</h3>");
                                echo ("</td>");
                                echo ("</tr>");
                                // category
                                echo ("<tr>");
                                echo ("<td>Category</td><td><select name='category'>");
                                echo ("<option value=''selected></option>");  
                                echo ("<option value='hard_drive'>Hard Drive</option>");
                                echo ("<option value='printer'>Printer</option>");
                                echo ("<option value='laptop'>Laptop</option>");
                                echo ("<option value='mobilephone'>Mobilephone</option>");
                                echo ("<option value='computer_tower'>Computer Tower</option>");
                                echo ("<option value='cables_mouse_keyboards'>Cables - Mouse - Keyboards</option>");
                                echo ("<option value='ink'>Ink</option>");
                                echo ("</select></td>");
                                echo ("</tr>");
                                echo ("<tr><td>                                 </td></tr>");
                                // brand
                                echo ("<tr>");
                                echo ("<td>Brand</td><td><input type='text' name='brand'></td>");
                                echo ("</tr>");
                                // model
                                echo ("<tr>");
                                echo ("<td>Model</td><td><input type='text' name='model'></td>");
                                echo ("</tr>");
                                // condition
                                echo ("<tr>");
                                echo ("<td>Condtion:</td>");
                                echo ("</tr>");
                                echo ("<tr>");
                                echo ("<td>New<input type='radio' name='condition' value='new'></td>");
                                echo ("<td>Used<input type='radio' name='condition' value='used'></td>");
                                echo ("</tr>");
                                //data cleansing
                                echo ("<tr>");
                                echo ("<td>Data Cleansing:</td>");
                                echo ("</tr>");
                                echo ("<tr>");
                                echo ("<td>Gold (£5)<input type='radio' name='data_cleansing' value='gold'></td>");
                                echo ("<td>Silver (£2)<input type='radio' name='data_cleansing' value='silver'></td>");
                                echo ("<td>Bronze (free)<input type='radio' name='data_cleansing' value='bronze'></td>");
                                echo ("</tr>");
                                //echo ("<tr width='500px'></tr>");
                                //bottone per inviare i dati
                                echo ("<tr>");
                                echo ("<td><input name='pulsante' type='submit' onclick='this.disabled=true' value='positivo'></td>");
                                echo ("</tr>"); 
                            
                            }
                                /*echo ("<tr>");
                                echo ("<td><input type='submit' value='Ok' name='ok'></td>");
                                echo ("</tr>");*/
                                
                                
                        ?>
                            
                </form>
                </table>
        
        </body>
</html>
I pulsanti "positivo" non servono, sperimentavo soluzioni, ma senza successo...