Code:
function guestbook_prikaz(){
           
        //Stranichenje
         $guestbook_limit = 10;
        if(!isset($_GET['str']) || empty($_GET['str']) || $_GET['str'] == 1){
            $str = 1;
              $prvilimit = 0;
             $limit = $prvilimit.",".$guestbook_limit;    
            $limitd = $_GET['str']-5;
            $limitg = $_GET['str']+5;
            $limitu = $limitd.", ".$limitg;    
            echo 'LIMIT='.$limitu;
        } else {
            $str = $_GET['str'];
              $poslednjilimit = $_GET['str'] * $guestbook_limit;
            $prvilimit = $poslednjilimit-$guestbook_limit;
            $limit = $prvilimit.",".$guestbook_limit;
            $gp = $ipage + 5;
            $dp = $ipage - 5;            
            $limitd = $_GET['str']-5;
            $limitg = $_GET['str']+5;
            $limitu = $limitd.",".$limitg;    
            echo 'LIMIT='.$limitu;
            
        } 
        //kraj stranicenja
        //prikaz guestbook-a
        $db = konekcija();
        $upit = "SELECT autor, mesto, email, DATE_FORMAT(datum, '%d/%m/%Y, %H:%i:%s') as formatiran_datum, komentar, dozvola FROM guestbook WHERE dozvola=1 ORDER BY id DESC LIMIT $limit";
        $rezultat = mysql_query($upit, $db);
        
        while($red = mysql_fetch_array($rezultat)){
            echo '<table class="tbl_guestbook">';
            echo '<tr>';
            if($red["formatiran_datum"]!="00/00/0000, 00:00:00"){
                echo '<td><b>'.$red["formatiran_datum"].'</b></td>';
            }else{
                echo '<td><b>Nepoznat datum i vreme upisa</b></td>';
            }
               echo '</tr>';
            echo '<tr>';
            echo '<td><em>'.$red["komentar"].'</em></td>';
              echo '</tr>';
              echo '<tr>';
            echo '<td align="right"><a href="mailto:'.$red["email"].'">'.$red["autor"].'</a>, '.$red["mesto"].'</td>';
              echo '</tr>';
              echo '</table>';            
        }    
        //kraj prikaza guestbook-a
        //stranicenje
        
        echo '<center>';
        $upit1 = "SELECT * FROM guestbook WHERE dozvola=1";                
        echo $upit1.'<br>';
        $broj_redova = mysql_num_rows(mysql_query($upit1));        
        $pom = ($_GET["str"] - 0);
        $back = $pom - 1;
        $next = $pom + 1;
        if($back >0) {
            echo "<span class='strane'><a href='".$_SERVER['PHP_SELF']."?str=".$back."'> Prethodna </a></span>";
        }

        $s=0;
        for($i=0;$i<=$broj_redova;$i=$i+$guestbook_limit) {                    
            $lasti = $i+$guestbook_limit;
            $ipage = $lasti/$guestbook_limit;        
                    
            if($ipage<>$pom){
                    
                echo "<span class='strane'><a href='".$_SERVER['PHP_SELF']."?str=".$ipage."'> ".$ipage." </a></span>";
                $s++;
                
            }
            else {
                            
                echo "<span class='strane_active'>".$ipage."</span>";
                $s++;
                    
            }
            
            if($i+$guestbook_limit <= $broj_redova) {
                   echo " ";                        
            }
        
        }
            if($next <= $s) {
                echo "<span class='strane'><a href='".$_SERVER['PHP_SELF']."?str=".$next."'> Slede&#263;a </a></span>";
            }            
        echo '</center>';
        
        //Kraj stranichenja 
    }