How to display the products by brands

I'm Using magento 1.7.0.2. I used this code to display products by manufacturer. but this shows that products by search criteria.

I need show the products products in individual page like this page(brands in left-bottom)

<?php 
    $product = Mage::getModel('catalog/product');  
    $attributes = Mage::getResourceModel('eav/entity_attribute_collection')  
    ->setEntityTypeFilter($product->getResource()->getTypeId())  
    ->addFieldToFilter('attribute_code', 'manufacturer');  
    $attribute = $attributes->getFirstItem()->setEntity($product->getResource());  
    $manufacturers = $attribute->getSource()->getAllOptions(false);
?>


<h1>Brands</h1>

<ul id="manufacturer_list">  
    <?php foreach ($manufacturers as $manufacturer): ?>  
        <li><a href="<?php echo Mage::getBaseUrl(); ?>catalogsearch/advanced/result/?manufacturer[]=<?php echo $manufacturer['value'] ?>"><?php echo $manufacturer['label'] ?></a></li>  
    <?php endforeach; ?>  
</ul>

some one help me. thanx in advance....... :)

Solution

You should change the URL

<li><a href="<?php echo Mage::getBaseUrl(); ?>catalogsearch/advanced/result/?manufacturer[]=<?php echo $manufacturer['value'] ?>"><?php echo $manufacturer['label'] ?></a></li>

To:

<li><a href="<?php echo Mage::getBaseUrl(); ?>NAMEOFTHECATEGORY?manufacturer=<?php echo $manufacturer['value'] ?>"><?php echo $manufacturer['label'] ?></a></li>

You should specify the NAMEOFTHECATEGORY of the products to display, otherwise it might not show all results. Otherwise you would need an extension like http://www.magentocommerce.com/magento-connect/shop-by-brands.html or this one http://amasty.com/improved-navigation.html which it's quite useful