Shell Script for logging into a ssh server

I tried writing a shell script which can do automatic login into a ssh server using password which is mentioned in the script. I have written the following code:

set timeout 30/usr/bin/ssh -p 8484 root@172.31.72.103expect {"root@172.31.72.103's password"   {      send "password\r"   }}

This code is not running properly, still it is asking for the password. Can somebody please help me in solving this