# File lib/cgi.rb, line 1688
    def image_button(src = "", name = nil, alt = nil)
      attributes = if src.kind_of?(String)
                     { "TYPE" => "image", "SRC" => src, "NAME" => name,
                       "ALT" => alt }
                   else
                     src["TYPE"] = "image"
                     src["SRC"] ||= ""
                     src
                   end
      input(attributes)
    end