Get product Image in Top Menu in magento 1.9.1

app\code\local\Mage\Catalog\Model\Observer.php

find function _addCategoriesToMenu()

replace
$categoryData = array(
                'name' => $category->getName(),
            'id' => $nodeId,
            'url' => Mage::helper('catalog/category')->getCategoryUrl($category),
            'is_active' => $this->_isActiveMenuCategory($category),
            'thumbnail' => Mage::getModel('catalog/category')->load($category->getId())->getImage()

            );

app\code\local\Mage\Page\Block\Html\Topmenu.php

find function getHtml()

remove
 if ($renderer = $this->getChild('catalog.topnav.renderer')) {
            $renderer->setMenuTree($this->_menu)->setChildrenWrapClass($childrenWrapClass);
            $html = $renderer->toHtml();
        } else {
            $html = $this->_getHtml($this->_menu, $childrenWrapClass);
        }

add

$html = $this->_getHtml($this->_menu, $childrenWrapClass);


and in _getHtml()

replace

$parentLevels = $child->getLevel();

       
          $urls = Mage::getBaseUrl('media').'catalog/category/'.$child->getData('thumbnail');
    $img = '<img src="'.$urls.'" />';

$html .= '<li ' . $this->_getRenderedMenuItemAttributes($child) . '>';
$html .= '<a href="' . $child->getUrl() . '" ' . $outermostClassCode . '><span>'
    . $this->escapeHtml($child->getName()) . ' </span>  </a>';