startup script

question

I am trying to mount a network drive with a shell script, one that requires sudo to run. I have it start up on login, but it prompts for a password each time for the sudo. Is there a way to bypass that? I tried the visudo nopasswd thing but it did not do the trick. I know this is a probably basic but im at a total loss right now. It uses an nfs command, if thats something that changes the outcome.