Php FInd id

include "admin/database.php";
                            $query = "SELECT * FROM bel_re WHERE id= " . $_GET['id'];
                            $res = mysql_query($query);
                            $article = mysql_fetch_array($res);
                            echo "<strong><h2>".$article['title'] . "</h2></strong><br />";
                            echo $article['text'] . "<br />";

                            //slider van de homepage ingevult met images van het onderwerp
                        ?>

                        <div class="imgslider">
                        <?php
                        include "admin/database.php";
                            $query = "SELECT * FROM bel_re WHERE id= " . $_GET['id'];
                            $res = mysql_query($query);
                            $article = mysql_fetch_array($res);

                            echo    "<div id=\"da-slider\" style=\"background:url(" . $article['link'] ." ) no-repeat center   \" class=\"da-slider\"> ";
                            echo    "<div class=\"da-slide\">";
                            echo    "<div class=\"da-img\"><img src=\" ". $article['link'] ."\" width=\"100%\" height=\"267px\" alt=\"image01\" /></div> ";
                            echo    "</div>";

                            if ($article['linkd1'] != NULL){
                                echo    "<div class=\"da-slide\" >";
                                echo    "<div class=\"da-img\"><img src=\" ". $article['linkd1'] ."\"  height=\"267px\" alt=\"image01\" /></div> ";
                                echo    "</div>";
                            }

                            if ($article['linkd2'] != NULL){
                                echo    "<div class=\"da-slide\" >";
                                echo    "<div class=\"da-img\"><img src=\" ". $article['linkd2'] ."\"  height=\"267px\" alt=\"image01\" /></div> ";
                                echo    "</div>";
                            }

                            if ($article['linkd3'] != NULL){
                                echo    "<div class=\"da-slide\" >";
                                echo    "<div class=\"da-img\"><img src=\" ". $article['linkd3'] ."\"  height=\"267px\" alt=\"image01\" /></div> ";
                                echo    "</div>";
                            }

                            if ($article['linkd4'] != NULL){
                                    echo    "<div class=\"da-slide\" >";
                                    echo    "<div class=\"da-img\"><img src=\" ". $article['linkd4'] ."\"  height=\"267px\" alt=\"image01\" /></div> ";
                                    echo    "</div>";
                            }

                            echo    "<nav class=\"da-arrows\">";
                            echo    "<span class=\"da-arrows-prev\"></span>";
                            echo    "<span class=\"da-arrows-next\"></span>";
                            echo    "</nav>";

                            echo    "</div>";
                            ?>