How do I echo the results of the SELECT statement?

I need to echo the results of the categories/subcategories below.  I am having trouble with the correct select statement.

Thanks for any assistance you can give me!!



<?php


$sql = "SELECT DISTINCT category FROM ddcart_products";
$result = mysql_query($sql) or die('Error: '.mysql_error());
echo '<option value="">- Pick a Category -</option>';
while($data = mysql_fetch_assoc($result)) {
  echo '<option value="'.$data['category'].'">'.$data['category'].'</option>';
 $sql2 = "SELECT DISTINCT subcategory FROM ddcart_products
           WHERE category = '{$data['category']}'";
  $result2 = mysql_query($sql2) or die('Error: '.mysql_error());
  if(mysql_num_rows($result2)>0) {
    /*echo '<optgroup>'*/;
    while($data2 = mysql_fetch_assoc($result2))
      echo '<option value="'.$data2['subcategory'].'">- ' .
           $data2['subcategory'].'</option>';
    echo '</optgroup>';
  }
}

  echo $res;
?>
</select> <input type="submit" value="Go"></form></div>
<div class="clear" style="height: 1px;"></div>
</div>

        <div class="clear" style="height: 1px;"></div>

    <?php

            //number of items per page
            $numitems = getOptionValue('itemsperpage');

            if(isset($_GET['page'])) {
                    $page = $_GET['page'];
                } else {
                        $page = 0;
                }
            //determine offset
            $offset = $page*$numitems;


//    NEED HELP GETTING RESULTS


                $sql = "SELECT * FROM ddcart_products WHERE category = ".$res." LIMIT ".$offset.", ".$numitems;
                $result = mysql_query($sql);
                $i = 1;
                while($data = mysql_fetch_assoc($result)) {
                        ?>
            <div class="productblock draggablediv" product="<?php echo $data['id'].'|'.$data['name'].'|'.$data['price']; ?>">
                    <div class="pbimage">  <img width=150 src="<?php echo $data['photourl']; ?>">   <!--<?php echo displayProductImage($data['id'], 'thumb'); ?>--></div>
                <div class="pbinfo"><a href="productdetail.php?product=<?php echo $data['id']; ?>" class="detailslink">View Details</a></div>
                <div class="pbtitle"><?php echo stripslashes($data['name']); ?></div>
                <div class="pbprice"><?php echo "$".number_format($data['price'], 2, '.', ','); ?></div>
            </div>
            <?php

            if(($i % 4) == 0) echo '<div class="clear"></div>';

            $i++;


                }

                echo '<div class="clear"></div><div id="pagenums" style="text-align: center;">';

                //total number of pages
                $sql = "SELECT * FROM ddcart_products WHERE cat = '".$cat."'";
                $result = mysql_query($sql);
                $numpages = floor(mysql_num_rows($result)/$numitems);

                for($i = 1; $i <= $numpages; $i++) {
                        if($page == $i) {
                                echo '<strong><span style="font-size: 12px; text-decoration: underline;"><a href="index.php?cat='.$cat.'&page='.$i.'">'.$i.'</a></strong>';
                        } else {
                                echo '<a href="index.php?cat='.$cat.'&page='.$i.'">'.$i.'</a>';
                        }

                }

                echo '</div>';

        ?>