def detect_opera_mobile()
      if (user_agent.include?(ENGINE_OPERA) && (user_agent.include?(MINI) || user_agent.include?(MOBI)))
        return true
      end
      return false
    end
def detect_opera_mobile()
      if (user_agent.include?(ENGINE_OPERA) && (user_agent.include?(MINI) || user_agent.include?(MOBI)))
        return true
      end
      return false
    end
=begin
*
     * Detects Opera Mobile or Opera Mini.
     * @return detection of an Opera browser for a mobile device

=end