Welcome to the Q&A Forum

It all depends on the page code. In general I would not be scared about using JS in your page. But it all depends on how you use it. It's a vast topic. Let me try to reduce it to something very small. As far as you serve browsers an html page which includes all the content you want google to index, you are probably safe. When you serve an html page with a portion of that content and you load additional content with AJAX, you are almost sure google won't index it properly. Google notoriously penalize pages which tries to stuff content for google bot manipulating it with JS to hide it from real visitors eyes. That's bad. But in between are endless possibilities and it all comes to what your JS is doing. So it's hard to define a general rule. Said that, today you can find examples of tabbed content in pure CSS: https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=pure%20css%20tabs Like this nice one: http://codepen.io/wallaceerick/pen/ojtal But, also CSS has it's drawbacks, mainly browsers support: http://www.w3schools.com/cssref/css3_browsersupport.asp

Fergclaw, It may boil down to the quality of those slim back links you mentioned.  You call them relevant, but you don't attest to their quality. I think if you can honestly say that the few links you have are quality, editorial links, then redirecting those domains (not necessary the specific urls (for appearances sake)) to appropriate subdirectories on the new site could be a step towards keeping the whole thing under the filter threshold. As an additional appearances-sake step, you may choose not to redirect any of the other non-linked-to domians--I mean, what value is there in redirecting them, anyway?

It works, thanks a million!  I recommend Martijn's tool for anyone having this need.