Setting the Global Navigation
By default the SharePoint menu is two level deep: it contains a major and a minor level, look like this: By the way: we can expand it! You need to open the master page, and edit the TopNavigationMenu property. The StaticDisplayLevels defines the number
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Read the complete post at http://www.sharepointblogs.com/aghy/archive/2007/11/15/setting-the-global-navigation.aspx