Missing Parenthese Error: ORA-00907

Anyone see anything wrong with this:

create or replace function HourParser(DayTimeValue In Integer) return varchar2 is

   Result varchar2(20);
begin

      Execute Immediate
      'SELECT CASE (WHEN :x > 1) THEN "YES" END
       FROM DUAL' Into Result Using DayTimeValue;

Return(result);
end HourParser; Received on Tue Apr 06 2004 - 00:08:15 CEST