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The Blogger Navbar replaces the default ad block formerly inserted on blogspot.com pages with a more useful navigation tool. Navbar features include:

• Blogger: takes you back to www.blogger.com. Search: searches the blog you're viewing, via Google SiteSearch.
  
• BlogThis!: a popup for quick 'n easy blogging, further explained in the BlogThis! Help article.
  
• Get Your Own Blog: another link to www.blogger.com.
  
• NextBlog: takes you to a recently-updated blog chosen at random by Blogger