CREATING A POPUP MENU

          print $query->popup_menu('menu_name',
                                   ['eenie','meenie','minie'],
                                   'meenie');

             -or-

          %labels = ('eenie'=>'your first choice',
                     'meenie'=>'your second choice',
                     'minie'=>'your third choice');
          print $query->popup_menu('menu_name',
                                   ['eenie','meenie','minie'],
                                   'meenie',\%labels);

               -or (named parameter style)-

          print $query->popup_menu(-name=>'menu_name',
                                   -values=>['eenie','meenie','minie']
+,
                                   -default=>'meenie',
                                   -labels=>\%labels);

       popup_menu() creates a menu.

       1.  The required first argument is the menu's name
           (-name).

       2.  The required second argument (-values) is an array
           reference containing the list of menu items in the
           menu.  You can pass the method an anonymous array, as
           shown in the example, or a reference to a named array,
           such as "\@foo".

       3.  The optional third parameter (-default) is the name of
           the default menu choice.  If not specified, the first
           item will be the default.  The values of the previous
           choice will be maintained across queries.

       4.  The optional fourth parameter (-labels) is provided
           for people who want to use different values for the
           user-visible label inside the popup menu nd the value
           returned to your script.  It's a pointer to an asso-
           ciative array relating menu values to user-visible
           labels.  If you leave this parameter blank, the menu
           values will be displayed by default.  (You can also
           leave a label undefined if you want to).
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