magento display attribute in dropdown

Create a attribute
and then
edit app/code/core/Mage/Catalog/Block/Navigation.php

public function getAllManu()
{
$product = Mage::getModel(‘catalog/product’);
$attributes = Mage::getResourceModel(‘eav/entity_attribute_collection’)
->setEntityTypeFilter($product->getResource()->getTypeId())
->addFieldToFilter(‘attribute_code’, ‘manufacturer’); //can be changed to any attribute
$attribute = $attributes->getFirstItem()->setEntity($product->getResource());
$manufacturers = $attribute->getSource()->getAllOptions(false);
return $manufacturers;
}
and then
edit app/design/frontend/default/default/template/catalog/navigation/top.phtml

1. <select id=“select-manufacturer” onchange=“window.location.href=this.value”>
2. <option value=“#” selected=“selected”>–Select Manufacturer–</option>
3.     <?php foreach ($this->getAllManu() as $manufacturer): ?>
4.         <option value=“/catalogsearch/advanced/result/?manufacturer[]=<?php echo $manufacturer['value'] ?>”><?php echo $manufacturer['label'] ?></option>
5.     <?php endforeach; ?>
6.     </select>