Can't seem to figure this out

[fastsol1]

So I am making a products area and I have a left sidebar that will hold the categories and the brands with in the categories. What I want is the list to only show the main categories until a category is selected then once the page f=refreshes with the GET variable the list will change to show the brands with in the category selected. Now I can get is to show all the brands in the categories but not just the one that is selected. I think I am on the right track with this but just can't seem to get it. Here is a link to the page so you can see the result - http://shootersbilliardclub.com/store.php I am echoing the id's so you can see the numbers as to where they should be in relation to the category numbers and how they are not showing that way.

$_GET['catid'] = mysql_real_escape_string($_GET['catid']);
$catid = $_GET['catid'];

$get_brands = mysql_query("SELECT * FROM prod_brands");
$brands = mysql_fetch_array($get_brands);
    $brand_id = $brands['brand_id'];
    $brand = $brands['brand'];
    $b_cat_id = $brands['b_cat_id'];
    
$get_cats = mysql_query("SELECT * FROM prod_cats");

echo "<ul class='categories'>";
while ($cats = mysql_fetch_array($get_cats))
{
    $prod_cat_id = $cats['prod_cat_id'];
    $prod_cat_title = $cats['prod_cat_title'];
    echo $prod_cat_id;
    
    echo "<a href='store.php?catid=$prod_cat_id'><li>$prod_cat_title</li></a>";
  if ($catid)
  {
   if ($b_cat_id == $_GET['catid'])
   {
    if ($b_cat_id !==0)
        {
          
          while ($brands = mysql_fetch_array($get_brands))
            {
            $brand_id = $brands['brand_id'];
            $brand = $brands['brand'];
            $b_cat_id = $brands['b_cat_id'];

            echo $b_cat_id;
            echo "<ul><li><a href='b-products.php?b_id=$brand_id'>$brand</a></li></ul>";
            }
              
        }
        else {}
    }        
  }
  else{}
}
echo "</ul>"; 

[fastsol1]

Figured it out! If anyone has a similar issue and wants to know the code I used to make it work just let me know and I will post it up.