It's OK. - I think that I have found the answer:

TOC are created as rows on headers and footers. - Why? - Who knows? - Bearing in mind that that follows the generic header / footer layout makes the use of TOCs for headers / footers completely useless because most people (myself included) are going to want to use TOC in vertical format when using in in headers or footers.

Just found:

CSS Horizontal Drop Down Menu http://www.zen-cart.com/index.php?ma...roducts_id=479