sybase script don't understand trouble - sql

Question

I 'm not a regular of Sybase ASE.
Tring to make a script to add line into a tempory table.
sybase version 12.5.4
BEGIN
declare and init variable
--boucle
select * into #parTemp from Parution where 1=2
WHILE #dateCourante <= #dateFin
BEGIN
select #dpart1=datepart(mm,#dateCourante)
select #dpart2=datepart(dd,#dateCourante)
select #dpart3=datepart(dw,#dateCourante)
--si on est pas le 1er mai
if #dpart1 <> 5 AND #dpart2 <> 1
begin
--id parution
select #idPar = #idPar + 1
select #idParChaine = convert(varchar(10),#idPar)
--num parution
select #numPar = #numPar + 1
select #numParChaine = convert(varchar(20),#numPar)
--prix du jour courant
if datepart(dw,#dateCourante)=6
select #prixCourant = #prixVen
else
if datepart(dw,#dateCourante)=1
select #prixCourant = #prixDim
else
select #prixCourant = #prix
end
end
insert into #parTemp values (#idParChaine,#dateCourante,#numParChaine,#nbPagination,#prixCourant,#poids,#parCompt,#parOJD,#resVal)
end
select #dateCourante = dateadd(dd,1,#dateCourante)
END
END
Errors i get :
Error code 156, SQL state ZZZZZ: Incorrect syntax near the keyword 'WHILE'.
Error code 156, SQL state ZZZZZ: Incorrect syntax near the keyword 'end.
Error code 156, SQL state ZZZZZ: Incorrect syntax near the keyword 'End'.
i really don't understand, thank for help.
Pierre