ssh connectivity

Hi,
I have two unix servers named as

uni115.net 
uni116.net

In both the boxes, I have sudo access to access some file.

From uni115.net , I need to login to uni116.net through script And while running my main script , it wont ask the password for login to another machine. How can we do this. I used the ssh concept inside the shell script. But i dono how to add the password detail while logging to other server. Pls help on this.

Thanks
Chells.

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