topic-subtopic-speciality v1

<?php
include("connect.php");
$topic=isset($_GET['topic'])?$_GET['topic']:'';
$sub_topic=isset($_GET['sub_topic'])?$_GET['sub_topic']:'';
$speciality=isset($_GET['speciality'])?$_GET['speciality']:'';
?>
<link href="style.css" rel="stylesheet" type="text/css" />
<div class='find'>
<div class="topic">
        <div class="top">Kategori<hr>
        </div>
        <?php
        $aa = "SELECT * FROM topic";
        $bb = mysql_query($aa); ?>
    <div class="browserPane">
        <table class="browser"><?php
                $c = 0;
                        while ($cc = mysql_fetch_array($bb)) { ?>
                        <tr class="<?php echo ($c++%2==1) ? 'odd' : 'even' ?>">
                                <td><a href="?topic.php&topic=<?php echo $cc[id_topic]?>"><?php echo $cc[topic];?></a></td>
                        </tr> <?php
                        $baris++; } ?>
                </table>
        </div>
</div>
<div class="sub-topic">
        <div class="top">Sub-Kategori<hr>
        </div><?php
        if(!empty($topic)){
        $dd = "SELECT * FROM topic_sub_topic WHERE id_topic='$topic'";
    $ee = mysql_query($dd); ?>
    <div class="browserPane">
        <table class="browser"><?php
                $c = 0;
                        while ($ff = mysql_fetch_array($ee)) { ?>
                        <tr class="<?php echo ($c++%2==1) ? 'odd' : 'even' ?>">
                                <td><a href="?topic.php&topic=<?php echo $topic?>&sub_topic=<?php echo $ff[id_sub_topic]?>"><?php echo $ff[sub_topic];?></a></td>
                        </tr> <?php
                        $baris++; } ?>
                </table>
        </div>
        <?php } ?>
</div>
<div class="specality">
        <div class="top">Specality<hr>
        </div><?php
        if(!empty($sub_topic)){
        $gg = "SELECT * FROM sub_topic_specality  WHERE id_sub_topic='$sub_topic'";
        $hh = mysql_query($gg); ?>
    <div class="browserPane">
        <table class="browser"><?php
                $c = 0;
                        while ($ii = mysql_fetch_array($hh)) { ?>
                        <tr class="<?php echo ($c++%2==1) ? 'odd' : 'even' ?>">
                                <td><a href="?topic.php&topic=<?php echo $topic?>&sub_topic=<?php echo $sub_topic?>&specality=<?php echo $ii[id_specality];?>"><?php echo $ii[specality]; ?></a></td>
                        </tr> <?php
                        $baris++; } ?>
                </table>
        </div>
        <?php } ?>
</div>
</div>
<div class="home">
        <p class="title">results</p>
</div>
<div id="result">
        <table class="Daftar">
                <?php
                $sql="SELECT * FROM matkul WHERE 1 "
                    .(!empty($topic)?"AND id_topic='$topic' ":"")
                    .(!empty($sub_topic)?"AND id_sub_topic='$sub_topic' ":"")
                    .(!empty($speciality)?"AND id_speciality='$speciality' ":"");
                $result = mysql_query($sql);
                if (empty($result)) {
                        echo '<tr class="current">
                        <td style="width: 100%;">Pilih Kategori</td>
                        </tr>';
                } else { ?>
                <tr class="current">
                        <td>NO</td>
                        <td style="width: 90px;">Number</td>
                        <td style="width: 500px;">judul</td>
                        <td style="width: 90px;">specality</td>
                </tr>
                <?php
                  $nomor=0;
                  while ($data = mysql_fetch_array($result)) { ?>
                <tr class="hasil">
                        <td align="center"><?php echo ++$nomor; ?></td>
                        <td><a href="home.php?ref_id=<?php echo $data[kode]; ?>"><?php echo $data[kode]; ?></a></td>
                        <td><a href="home.php?ref_id=<?php echo $data[kode]; ?>"><?php echo $data[nama]; ?></a></td>
                        <td><a href="home.php?ref_id=<?php echo $data[kode]; ?>"><?php echo $data[id_specality]; ?></td>
                </tr>
                <?php
                  }
                }?>
        </table>
</div>