su command question

[Robert Dailey]

HI,

I'm running Ubuntu Server 8.04 and I'm creating a bash script to start
a server program as follows:

su ventrilo -c "/etc/ventrilo/ventrilo_srv -d"

However, the 'su' command makes me insert the password for user
'ventrilo' when I run the bash script containing the line of code
above. How can I make this work without the password prompt? I also
don't want this to be a security issue (for example, I don't want
people to be able to connect to my server using PuTTY and login as
'ventrilo' with no password...

Thanks in advance.