chat.js

    var chat = {}
    chat.fetchMessages = function () {
       $.ajax({     url: '/chat/ajax/chat.php',
           type: 'post', 
              data: { method: 'fetch' }, 
                 success: function(data) {
                        $('.chat .messages').html(data);   
                          } 
                           });
                             }
                 chat.throwMessage = function (message) {
                 if ($.trim(message).length !=0) {
                 $.ajax({     
                 url: '/chat/ajax/chat.php',
                 type: 'post',   
                  data: { method: 'throw', message: message },
                    success: function(data) {     
                      chat.fetchMessages();   
                      chat.entry.val('');
               } 
                });   
                  } 
                   }
                   
                    chat.entry = $('.chat .entry');
                  chat.entry.bind('keydown', function(e) {
                        if (e.keyCode === 13 && e.shiftKey === false) { 
                                chat.throwMessage($(this).val());
                      event.preventDefault();     
                          }     
                           });
       chat.interval = setInterval(chat.fetchMessages, 15000);
       chat.fetchMessages();
       
       
    function Smile(smiley)
        {
       
            var currentText = document.getElementById("zprava");
           
            var smileyWithPadding = " " + smiley + " ";
            currentText.value += smileyWithPadding;
        currentText.focus();
       
        }
            function Names(name)
        {
       
            var currentText = document.getElementById("zprava");
           
            var nameWithPadding = ""+name+"";
            currentText.value = nameWithPadding;
        currentText.focus();
       
        }
        

    <?php
    class Chat extends Core{
         public function fetchMessages() {
              $this->query("
               SELECT     `chat`.`message`,
                           `chat`.`timestamp`,
                           `chat`.`ip`,
                           `chat`.`message_id`,
                           `uzivatele`.`jmeno`,
                           `uzivatele`. `id`,
                           `uzivatele`. `admin`
               FROM        `chat`
               JOIN        `uzivatele`
               ON          `chat`.`id` = `uzivatele`.`id`
               ORDER BY    `chat`.`timestamp`
               DESC           
              ");
             
              return $this->rows();
         }
         public function throwMessage($id, $message){
         $adr=$_SERVER["REMOTE_ADDR"];   
             $this->query("
                 INSERT INTO `chat` (`id`, `message`, `timestamp`, `ip`)
                 VALUES (" . (int)$id.", '" .$this->db->real_escape_string($message) ."', UNIX_TIMESTAMP(), '$adr')
             
             ");
         }
    }