gistfile1.php

<style>
    #current-category-content ul {
        padding-left: 20px;
    }

    .elastic-active-category-title span {
        color: silver;
    }
</style>
<div class="block block-list block-current-category">
    <div class="block-title">
        <strong><span><?php echo $this->__('Show results for') ?></span></strong>
    </div>
    <div id="current-category-content" class="block-content">
        <?php if (!empty($_GET['cat'])): ?>
            <div class="elastic-active-category-title"><span>&raquo; </span><?php echo Mage::getModel('catalog/category')->load((int)$_GET['cat'])->getName() ?></div>
        <?php else: ?>
            <div class="elastic-active-category-title"><span>&raquo; </span><?php echo Mage::registry('current_category')->getName() ?></div>
        <?php endif; ?>

    </div>
</div>
<script type="text/javascript">
//<![CDATA[
<?php if (!empty($_GET['cat'])): ?>
    var currentCategoryId = <?php echo (int)$_GET['cat'] ?>;
<?php else: ?>
    var currentCategoryId = <?php echo Mage::registry('current_category')->getId() ?>;
<?php endif; ?>

jQuery('#elastic-category-'+currentCategoryId).parents().each(function(){
    <?php /* Check if we reached top of the tree, then break loop */ ?>
    if (jQuery(this).attr('id') === 'elastic-category-listing') {
        return false;
    }

    <?php /* Build Amazon style "back to category" links */ ?>
    if (jQuery(this).attr('id') !== undefined) {
        var categoryLink = jQuery(this).find('a');
        jQuery('#current-category-content').prepend(
            jQuery('<div/>', {
                'html': '&laquo; ',
                'class': 'elastic-category-upper-level-wrapper'
            }).append(jQuery('<a/>', {
                'html': categoryLink.html(),
                'href': categoryLink.attr('href'),
                'class':'elastic-category-upper-level-link'
            }))
        );
    }
});

if (jQuery('#elastic-category-'+currentCategoryId+' > ul').length != 0) {

    var availableCategories = jQuery('<ul/>');

    jQuery('#elastic-category-'+currentCategoryId+' > ul').children().each(function (){
        availableCategories.append(jQuery('<li/>').append(jQuery(this).find('a:first')));
    });

    jQuery('#current-category-content').append(availableCategories);
}

jQuery('#elastic-category-listing').remove();

//]]>
</script>