Notice: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) AND `banners`.`status` = 1 AND `banners_contents`.`content` != '' ORDER ' at line 5:
Here is your query:

SELECT `banners`.`description`, CASE `banners`.`typeID` WHEN 1 then 'banners.image.tpl' WHEN 2 then 'banners.flash.tpl' WHEN 3 then 'banners.code.tpl' END AS `type`, `banners`.`sizeID`, `banners`.`width`, `banners`.`height`, 
						   `banners_contents`.`content`, `banners_contents`.`link` 
					FROM `banners` 
					JOIN `banners_contents` ON `banners_contents`.`bannerID` = `banners`.`id` AND `banners_contents`.`langID` = 1 
					WHERE (`banners`.`websiteVisible` = 1 OR (`banners`.`regionVisible` = 1 AND `banners`.`regionID` = )) AND `banners`.`status` = 1 AND `banners_contents`.`content` != ''
					ORDER BY `banners`.`date` DESC

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