extracting data for particular month

hi

i had a requirement where the date range was a selection parameter and accordingly i was pulling sales order using vbrk-fkdate field. this was the code i had written.

SELECT-options: p_fkdat for vbrk-fkdat obligatory ,

p_kunag for vbrk-kunag no-extension no intervals,

p_matnr for vbrp-matnr no-extension no intervals,

p_augru for vbrp-augru_auft no-extension no intervals,

p_vbeln for vbrk-vbeln no-extension no intervals.

SELECT *

FROM vbrk

INNER JOIN vbrp ON vbrk_{vbeln = vbrp}vbeln

INNER JOIN kna1 ON vbrk_{kunag = kna1}kunnr

INTO corresponding fields of TABLE itab

where

vbrk_{vbeln in p_vbeln and vbrk}kunag in p_kunag and vbrp_{matnr in p_matnr and vbrp}augru_auft in p_augru and vbrk~fkdat in P_fkdat .

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now the functional guy needs only the month and year to be entered in selection screen, and i need to get sales order data for the months entered. ( eg aug 06 - sep 06 )

how should i modify the code.