Thanks for the example Mimoun.
In your code the links from the left hand menu open the target in a new browser. Is there any way of opening the target in the middle column? I can do this in frames quite easily but I'd like to use CSS to handle the template. Is it a case of having the target as
<a href="http://www.example.com/mypage.html" "target=rightside">click here for info</a>