joomla menu module customization

Hi, this is a new project to fix a partial work made by a previous freelancer that was disappered. Goal is to adjust [login to view URL] menu: here you can find a 2 levels menu. - 1st level menu is the one you can find on home; - 2nd level menu is the one you can find clicking, for example, on "progetti" or "attività"; My request is to split this 2nd level menu in two columns in a dinamic way, so your script will split, for example, 13 items in two columns of 7 and 6 items or a 6 items in two columns of 3 and 3. This menu is now a module. My goal is that your work will be work on that site and will be a separated module too. [login to view URL] will be full compatible with mobile devices: menu, alignments and layout too. Check attachments and live site too. No skype, just PM. Have a nice day! ea