how to run sudo command such that it wont prompt for password

Hi,

I m new to linux env.
I have used pon, poff to connect/disconnect internet/adsl. I m successfull in connecting to net thru cmd line.
Now i want to connect to internet at specific time.
I want to use crontab for scheduling.

my crontab file ( o/p crontab -e)

# m h dom mon dow command
03 00 * * * /home/rudra/connect.sh
05 06 * * * /home/rudra/disconnect.sh
~
shell scripts contain
#!/bin/bash
sudo poff dsl-provider

#!/bin/bash
sudo pon dsl-provider

when i run the cmd, prompted for sudo password.
How to overcome this.

above cronjobs didnt execute.

o/p echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games

Any suggestions, i m not able to make out where i missed out.