rsync - Oct 2003 - Rsync password not working

Hi,

      I have installed CYGWIN in my windows 2000 prof machine .I want to
automate the RSYNC backup .The rsync --password-file=filename doesn't
seems to work .If i schedule the backup , the rsync asks for password at
the scheduled time .Please help me to automate the Rsync without asking
password 

Regards
Sumithra