OK, open /catalog/controller/common/header.php
Find this code
// Level 1 $this->data['categories'][] = array( 'name' => $category['name'], 'children' => $children_data, 'column' => $category['column'] ? $category['column'] : 1, 'href' => $this->url->link('product/category', 'path=' . $category['category_id']) );
change it to
// Level 1 $this->load->model('tool/image'); $image = empty($category['image']) ? 'no_image.jpg' : $category['image']; $thumb = $this->model_tool_image->resize($image, 100, 100); $this->data['categories'][] = array( 'name' => $category['name'], 'children' => $children_data, 'column' => $category['column'] ? $category['column'] : 1, 'thumb' => $thumb, 'href' => $this->url->link('product/category', 'path=' . $category['category_id']) );
Then in /catalog/view/theme/[your-theme-name]/template/common/header.tpl just use $category['thumb'] where you need it
Notice that I set the width and height to 100px in the above code, and you should change it accordingly
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