Script not working in iFrame. Options

[P6tu]

Hello,

So I've figured out a lot on my own and by googleing, but now I'm at a point, where I can't even find an answer from Google.
I've built this page from scratch over the years and I've been improving it step by step. This is the page I'm talking about:
Classic Rent
So I'm trying to move all my active information in the center column also to an iFrame. I haven't had any issues with iframes and scripts so far, but now I can't seem to be activating them all.
Test page
As you can see, then compared to the homepage, then the slideshow isn't working on the test page iFrame. Why is that?

And maybe there are people here, who could say, is it possible to change two different iFrames with a single navigation? Currently when browsing my webpage, then the heading changes the title accordingly. When I move my information from the center column to an iFrame, then I do not know, how would I be able to change the heading also, when navigating to a new page (new iFrame) from the left menu.

With best regards,
P6tu

[P6tu]

Search engines can get data from iFrames - or can't they?

[pandy]

They can. But the framed page will be orphaned. The search results will lead to the framed page, not the main page. That's normal IFRAMES. I don't know with a JS generated one.

SEs do read JS to some extent now, but I don't think they'll index JS generated text, so the bulk of your content is probably lost when it comes to SEs.

Why do you use JS so extensively? And why the IFRAME? Serious question, I'm curious. What's the advantage? I see only disadvantages...