Postgres: Starting Server in background mode

Hi,

       To start the postgres server in background mode in windows, i executed the following command:

runas /user:postgres "D:\postgres_new\pgsql\bin\pg_ctl.exe -W start -D D:\postgres_new\pgsql\data -l D:\postgres_new\pgsql\data\logfile"

         The postgres starts up all fine and logs get redirected.However, a command window gets opened which says "server starting...". How do i disable this command window ?

Thanks !