Develope a new section for a web (PHP+HTML)

Hi, The new section "Gastronomy" will be integrated in www.esibiza365.es. Nevertheless, because we have had enough problems of positioning (SEO) with [login to view URL] and seems to be that the internal code is confused and complex (doing that any modification is very costly), our short-term intention is to re-do the web [login to view URL] complete with some innovations. Therefore, we want to develop the new section in an independent way to the current code of [login to view URL], attending to the criteria of programming most standardized and focusing in the SEO, in the way to be able to integrate this section in the new version of www.esibiza365.es. The integration must be invisible; when the user goes from the old secctions to the new developed section “Gastronomy”, the user should don't feel any changes in the website navigation, like it was the same site. All the graphical work will be made by us. You can find a most detailed explanation with images in the attached doc. Regards, Aleix