of "submit" becomes the "value" property of the button (and thus its label).
If "confirm" is specified, the button will have an onclick handler that
displays the value of "confirm" in a popup message box and asks the user to
-confirm the choice.
+confirm the choice. The hashref may also have a "name" property, which
+sets the name of the submit button.
- "onclick" and "label". Creates a non-submit button that executes the
Javascript code in "onclick". "label" is used as the text of the button.