[Wlug] ssh/virtual terminal "challenge"

I have a situation where I'd like to run ssh from a script to connect to a different machine. In some cases, the machine's IP will have changed, due to DHCP. Is there a way I can either: 1. make ssh accept the new site without supplying the "yes" from the keyboard. or 2. Somehow set up a controlling terminal or virtual terminal to provide the "yes" that ssh requires? I have not been able to get something like "openvt" to work. I have no experience with these things. TIA, Bill