Page Tab Direction Destinations

I know that when you are on the home page and click on a page tab in the header tab string, that the selected tab issues some sort of GO-TO command with a designation to a URL with the page id of the destination.

I want to create a page tab on blog “A” that when clicked will jump to the “HOME” page of blog “B”, and a page tab on blog “B” that returns you to the “HOME” page of blog “A”.

I was able to do this on my twin blogs, thefundamentalist.info & opportunities.thefundamentalist.info – both using the “Seashore” theme. I am trying to do the same thing with my wife’s twin blogs, myServe.biz & myServe4u.myserve.biz – both using the “PrimePress” theme but it doesn’t work the same way.

Help/ Suggestions Please!!!