SQL & PL/SQL

I am trying to run pl/sql statements in oracle express edition 10g but it can not run! what can i do? which program should i download to run pl/sql???

pls help me!

thanks.

Code:
---------------------------------------------------------------------------------
SET SERVEROUTPUT ON

DECLARE
v_count NUMBER(2) := 1;
BEGIN
LOOP
DBMS_OUTPUT.PUT_LINE(v_count);
v_count := v_count + 2;
EXIT WHEN v_count > 10;
END LOOP;
END;
---------------------------------------------------------------------------------

Error code:

ORA-00922: missing or invalid option

The version:

Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

Edited by: user8944100 on 24.Oca.2010 12:31

Edited by: user8944100 on 24.Oca.2010 12:37