Writing Permission of Widows partition

[J.H.Kim <frog1120@gmail.com>]

Hi, everyone

I mounted windows xp partion as follows:
"mount -o iocharset=cp949 -t ntfs /dev/sda2 /mnt/windows -o umask=0000"

As a result, reading the windows partition is OK, but the writing is denied.
The directory of /mnt/windows permission mode is set all readable, writable, executable.
When I try to write any file to /mnt/windows, the error message "Permission denied" is prompted.

How can I fix it ?

Thanks in advnace.