Contributions

Lets have the category image delete button displayed if there is category image is available:

Change Step 3 with following changes:

Find:
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$contents[] = array('text' => '<br>' . tep_info_image($cInfo->categories_image, $cInfo->categories_name, HEADING_IMAGE_WIDTH, HEADING_IMAGE_HEIGHT) . '<br>' . $cInfo->categories_image);

Add following under it:
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if ($cInfo->categories_image) $contents[] = array('text' =>'<br><a href="' . tep_href_link(FILENAME_CATEGORIES, 'cPath=' . $category_path_string . '&cID=' . $cInfo->categories_id . '&action=delete_category_image') . '">' . tep_image_button('button_delete_image.gif', IMAGE_DELETE) . '</a>');

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Finally, don't forget to produce and add "button_delete_image.gif" in your /catalog/admin/includes/languages/[YOUR_LANGUAGE]/images/buttons folder

This contribution is created to delete a category image without deleting the category itself. It has nothing to do with multiple images for a sinle category