FETCHING THE VALUE OR VALUES OF A SINGLE NAMED PARAMETER:

          @values = $query->param('foo');

                    -or-

          $value = $query->param('foo');

      Pass the param() method a single argument to fetch the value of the
      named parameter. If the parameter is multivalued (e.g. from multiple
      selections in a scrolling list), you can ask to receive an array.
      Otherwise the method will return a single value.