The design of the website is controlled completely by a design system that you control. Each design has three main parts:
The page structure determines what goes on a web page and where. This will let you determine sidebars, headers, footers, or whatever you want. The definition of the page structure is done with standard XHTML 1.0 strict, with a few extra xml tags for placing Net-at-hand content. See the page structure page for complete information.
The look of the site is controlled by a single CSS file that you upload directly to Net-a-hand. There are a few special tags that you can use for some situations, but for the most part it is standard CSS. See the page structure page for more info.
Images that you want to use in your CSS file can be uploaded directly through the workspace Net-at-hand gives you for each client.