Features
Shows default link if logo not defined

Installation
Please Backup first

1 - Backup manufacturer.php in catalog/controller/product/manufacturer/
2 - Backup manufacturer_list.tpl in catalog/view/theme/default/template/product/
3 - Upload catalog folder in your root directory & owerwrtite all

Note : This extension will overwrite two files as i mentioned in step 1 and step 2.