A quick hack using the category tab module as a base-
First extract the two files from the attached zip. tpl_modules_manufacturers_tabs.php goes into includes\templates\YOUR CUSTOM FOLDER\templates\ and manufacturers_tabs.php goes into includes\modules.
Next edit includes\filenames.php- after the line that reads:
HTML Code:
define('FILENAME_LISTING_DISPLAY_ORDER', 'listing_display_order.php');
this is on line 174 on mine
add this line:
HTML Code:
define('FILENAME_MANUFACTURERS_TABS', 'manufacturers_tabs.php');
You may want to create separate styles for the manufacturer tab- I just went with the same styles used by the category tab to make it easier.
Finally edit your tpl_header.php file in includes\templates\YOUR CUSTOM FOLDER\common\. Below the line that reads:
HTML Code:
<!--eof-optional categories tabs navigation display-->
copy and paste the following code block:
HTML Code:
<!--bof-optional manufacturers tabs navigation display-->
<?php require($template->get_template_dir('tpl_modules_manufacturers_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_manufacturers_tabs.php'); ?>
<!--eof-optional manufacturers tabs navigation display-->
You might want to switch the categories tab off- Do this in Admin-> Layout Settings-> Categories-Tabs Menu ON/OFF