Getting Links To OpenIn New Windows

hi there

I was wondering if there was an easy way ( may be a plug-in or something) two globally said all externallinks to open in a new window?

FYI I'm trying to do this on the Social theme.

Also if there is no way to do this to the fact that anything that would affect global settings is unable to distinguish between an internal and external link is there a way to just do it globally for all linksbe they internal or external?

Thanks in advance for your assistance.