def add_bookmark(title, href, attributes = {}, &block)
      attributes = attributes.merge :title => title, :href => href
      add_child build(:bookmark, attributes, &block)
    end
def add_bookmark(title, href, attributes = {}, &block)
      attributes = attributes.merge :title => title, :href => href
      add_child build(:bookmark, attributes, &block)
    end
Builds a bookmark with given attributes and add it.