Magento Layered Navigation

<?php
    $param = '';
    if(isset($_GET['cat'])) {
        $curCatId = $_GET['cat'];
        $curCat = Mage::getModel('catalog/category')->load($curCatId);
        $param = "&cat=$curCatId";
    } else {
        $curCat = Mage::getSingleton('catalog/layer')->getCurrentCategory();
    }
    $subCatIds  = $curCat->getAllChildren(true);
    $_filters = $this->getActiveFilters();
?>

<?php if(!empty($_filters)): ?>
<div class="state">
    <p class="block-subtitle"><?php echo $this->__('Currently Shopping by:') ?></p>
    <dl>
    <?php foreach ($_filters as $_filter): ?>
            <dd>
                <?php if(get_class($_filter->getFilter()) == 'Mage_Catalog_Model_Layer_Filter_Attribute') :?>
                    <?php
                        $attributeModel = $_filter->getFilter()->getAttributeModel();
                        $attrOptions = $attributeModel->getSource()->getAllOptions();  //array of options
                        $catModel= Mage::getModel('catalog/category');
                        $filterColor = $this->stripTags($_filter->getLabel());

                        $colors = '';
                        foreach($subCatIds as $catId) {
                            $catModel->load($catId);
                            $collection = $catModel->getProductCollection();
                            $collection->addAttributeToSelect('apparel_color_value')
                                  ->getSelect()->group('apparel_color_value');
                            foreach($collection as $product) {
                                if ($product->isSaleable()) {
                                    $colors .= $product['apparel_color_value'].',';
                                }
                            }
                        }
                    ?>
                    <ol id="option-list-<?php echo $attributeModel->getAttributeId() ?>">
                    <?php foreach($attrOptions as $attr): ?>
                          <?php if($attr['value']): ?>
                              <?php if($attr["label"] != $filterColor): ?>
                                    <?php if(strpos($colors, $attr["label"].',') !== false) : ?>
                                          <li><a href="<?php echo $this->getUrl('').$curCat->getUrlPath() ?>?apparel_color=<?php echo $attr["value"]?><?php echo $param ?>" ><?php echo  $attr["label"]; ?></a></li>
                                    <?php endif; ?>
                              <?php else:?>
                                  <li class="current"> <?php echo $filterColor; ?></li>
                              <?php endif;?>
                        <?php endif; ?>
                    <?php endforeach;  ?>
                    </ol>
                <script type="text/javascript">decorateList('option-list-<?php echo $attributeModel->getAttributeId() ?>', 'none-recursive')</script>
            <?php else:?>
                  <ol>
                      <li>
                          <a href="<?php echo $_filter->getRemoveUrl() ?>" title="<?php echo $this->__('Remove This Item') ?>" class="btn-remove"><?php echo $this->__('Remove This Item') ?></a>
                          <span class="label"><?php echo $this->__($_filter->getName()) ?>:</span> <?php echo $_filter->getLabel() ?>
                      </li>
                  </ol>
            <?php endif; ?>
            </dd>
     <?php endforeach; ?>
    </dl>

    <a class="all" style="float:right;" href="<?php echo $this->getClearUrl()?>">All</a>
</div>
<?php endif; ?>