SQL & PL/SQL

hi everyone,
i have the requirement to find the week number for the calender..
so that week number should start with 01 when the year starts and it should end with week end date(that is first saturday of the january month).. so next week number starts with sunday and ends with saturday ,continously.. in the end date of the year it should not be 'saturday' but week number should end with last date of the year.. again in the next year it should start with '01'.

for example:
01-JAN-13 tuesday 01
02-JAN-13 wednesday 01
03-JAN-13 thursday 01
04-JAN-13 friday 01
05-JAN-13 saturday 01
06-JAN-13 sunday 02
07-JAN-13 monday 02
.
..
..
26-DEC-13 thursday 52
27-DEC-13 friday 52
28-DEC-13 saturday 52
29-DEC-13 sunday 53
30-DEC-13 monday 53
31-DEC-13 tuesday 53
01-JAN-14 wednesday 01
02-JAN-14 thursday 01


how can i achieve this, can anyone please help me out on this..

i have a query that starts with 01 when year starts but it gives problem in the end of the year .. described below with a query..

select mydate,
to_char(mydate,'day') as weekday,
to_char(next_day(mydate,'sunday'),'iw') as week_num

FROM ( SELECT TRUNC (SYSDATE, 'yy') - 1 + LEVEL AS mydate
FROM dual
CONNECT BY LEVEL <= (SELECT TRUNC (ADD_MONTHS (SYSDATE, 24), 'yy')
- TRUNC (SYSDATE, 'yy')
FROM DUAL))

this query gives date, weekday and week_num for 2 years 2013 and 2014,
when i run this query ,at the end of the 2013 it gives the result as,
26-DEC-13 thursday 52
27-DEC-13 friday 52
28-DEC-13 saturday 52
29-DEC-13 sunday 01
30-DEC-13 monday 01
31-DEC-13 tuesday 01
01-JAN-14 wednesday 01
02-JAN-14 thursday 01

for dates 29 ,30,31st it should give 53 .. how can i achieve that using this this query .. can any one help me out on this please...


thanks,
pradeep