NE MOZE DA IZBERE SODRZINI! ERR:
.SELECT c_id, c_cat_id, c_title, c_alias, c_active, c_hits, c_intro_image, c_sodrzina , cat_alias, CONCAT_WS('/', cat_alias, CONCAT_WS('-',c_id, c_alias)) AS full_link FROM contents,content_categories WHERE c_cat_id=cat_id AND c_cat_id = AND c_active = 1 AND c_published = 1 ORDER BY RAND() DESC LIMIT 6