Fw: [PHP] Rsync + ssh

Hi All i m using rsync command to transfer files from server to server. i use the below code rsync --password-file .passfile ssh remoteuser@remotehost:/remote/dir /localdir/dir/ where .passfile has the password... But eventhough i have passed the password file it asks for password... Please anybody tell me how t use the rsync command with ssh and without prompting for password Regards Syed