def obtain_comment_author(comment_id = nil)
      return nil if comment_id.blank?
      comm = Comment.find_by_id(comment_id)
      comm.author if !comm.blank?
    end
def obtain_comment_author(comment_id = nil)
      return nil if comment_id.blank?
      comm = Comment.find_by_id(comment_id)
      comm.author if !comm.blank?
    end
COMMENT Functions 
 returns the author name of the given comment
 Params:
 +comment_id+:: ID of the comment