breadcrumb script line on phpfreaks

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I have a breadcrumb scrpt that works well except I want it to be like the breadcrumb script here on phpfreaks.

 

I need to get parts of the url that the script gets to create the trail and query the database to replace those parts of the url.

 

Say i have a url like mydomain.com/forum/1/2,  where 1 is the board and 2 topic, how would i change the code so if the part[1] was forum it replaces parts 2 and 3 with what it's in the database?

 

Here is my breadcrumb script

 

function breadcrumb(
            $home = 'Home', // Name of root link
            $division = ' / ', // Divider between links
            $hidextra = true, // Toggle hide/show get data and fragment in text
            $index = false,  // Toggle show/hide link to directory if it does not contain a file
            $indexname = 'index.php' // The definition of the file the directory must contain
) {

$breadcrumb="";

    // Requested addons...
    $extension = '.php'; // Extension to cut off the end of the TEXT links
    $ifIndex = 'index.php'; // Filename of index/default/home files to not display
    // End requested addons

    $whole = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

    $parts = explode('/', $whole);
    $parts[0] = 'http://'.$parts[0];

$array = array('-', '%20');

    $breadcrumb .=  "<a href=\"{$parts[0]}\">{$home}</a>{$division}";
    $k = 1;
    for ($i=1;$i < sizeof($parts);$i++) {
        $uri = '/';
        while ($k <= $i) {
                $uri .= $parts[$k];
                if ($k != (sizeof($parts)-1)) $uri .= '/';
                $k++;
         }
          if (($index && is_dir($_SERVER['DOCUMENT_ROOT'].$uri) && is_file($_SERVER['DOCUMENT_ROOT'].$uri.$indexname) 
        || !$index 
        || !is_dir($_SERVER['DOCUMENT_ROOT'].$uri)) && $parts[$i] != $ifIndex) {
            $breadcrumb .= "<a href=\"$uri\">";
            if ($hidextra) {
                $breadcrumb .= rtrim(preg_replace("/\?.*$/", '', ucwords(str_replace($array," ",$parts[$i]))), $extension);
            }
            else {
                $breadcrumb .= rtrim(ucwords($parts[$i]), $extension);
            }
            $breadcrumb .= '</a>';
        }
        else {
            $breadcrumb .= ucwords(str_replace($array," ",$parts[$i]));
        }

          if (isset($parts[($i+1)])) {
            $breadcrumb .= $division;
        }
          $k = 1;
    }
    return $breadcrumb;
}