Crear login en delphi7 + Interbase

[Djsilver5]

Buenos días amigo, ayer estaba intentado poner el código tal cual me dijiste y me bota estos error del DataModule.

[Error] DataModule02.pas(52): Undeclared identifier: 'TDataModule2'
[Error] DataModule02.pas(52): 'END' expected but 'CONST' found
[Error] DataModule02.pas(52): Undeclared identifier: 'pwd'
[Error] DataModule02.pas(52): '=' expected but ';' found
[Error] DataModule02.pas(53): Expression expected but 'VAR' found
[Error] DataModule02.pas(55): Statements not allowed in interface part
[Error] DataModule02.pas(58): Undeclared identifier: 'IBDataBase1'
[Error] DataModule02.pas(59): Undeclared identifier: 'IBTransaction1'
[Error] DataModule02.pas(66): Undeclared identifier: 'Result'
[Error] DataModule02.pas(66): Operator not applicable to this operand type
[Error] DataModule02.pas(73): Declaration expected but end of file found
[Fatal Error] Sistema.dpr(7): Could not compile used unit 'DataModule02.pas'

EL código lo puse así:

Código Delphi [-]
unit DataModule02;

interface

uses
  SysUtils, Classes, DB, IBCustomDataSet, IBDatabase, IBQuery, IBTable,
  IBStoredProc;

type
  TDataModule2 = class(TDataModule)
    IBTransaction1: TIBTransaction;
    Procedimientos: TIBStoredProc;
    IBTEmpresas: TIBTable;
    IBQEmpresas1: TIBQuery;
    DSEmpresas: TDataSource;
    DSEmpresas1: TDataSource;
    IBTAgencia: TIBTable;
    IBQAgencia1: TIBQuery;
    DSAgencia: TDataSource;
    DSAgencia1: TDataSource;
    IBTUsuarios: TIBTable;
    DSUsuarios: TDataSource;
    IBQUsuarios1: TIBQuery;
    DSUsuarios1: TDataSource;
    IBDatabase1: TIBDatabase;
    IBTDNI: TIBTable;
    IBTDNIDES_DOC_IDE: TIBStringField;
    IBTDNICOD_DOC_IDE: TIBStringField;
    DSDNI: TDataSource;
    IBQDNI: TIBQuery;
    DTDNI1: TDataSource;
    IBTTipodePersona: TIBTable;
    IBQTipodePersona: TIBQuery;
    DSTipodePersona: TDataSource;
    DSTipodePersona1: TDataSource;
    IBTEstadoCivil: TIBTable;
    IBQEstadoCivil: TIBQuery;
    DSEstadoCivil: TDataSource;
    DSEstadoCivil1: TDataSource;
    IBTZona: TIBTable;
    IBQZona: TIBQuery;
    DSZona: TDataSource;
    DSZona1: TDataSource;
    IBTPassword: TIBTable;
    DSPassword: TDataSource;
    IBQPassword: TIBQuery;
    DSPassword1: TDataSource;
    //
  private
    //
  public
function TDataModule2.LoginAccepted(const nam, pwd: string): Boolean;
var
  qy: TIBQuery;
begin
  qy := TIBQuery.Create(nil);
  try
    qy.Database := IBDataBase1;
    qy.Transaction := IBTransaction1;
    qy.Close;
    qy.SQL.Clear;
    qy.SQL.Add('SELECT * FROM USUARIO');
    qy.SQL.Add('WHERE NOMBRE = :NOMBRE');
    qy.ParamByName('NOMBRE').AsString := nam;
    qy.Open;
    Result := not qy.IsEmpty and (qy.FieldByName('CLAVE').AsString = pwd);
    qy.Close;
  finally
    qy.Free;
  end;
end;