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]

Page/content managment. I want all my pages to look the same, but I also want to be able to change one part of the page. For example the menu. When I want to change something in the menu (add or remove something) then I only need to edit one html page and since the same content is in the same iframe. Now, when I would use the main conten in the iframe, then I'm able to drop the menu and all other stuff from the iframes and I'll only have the main content in iframe.
By the way, how do you use iframes without JS?
PS! The iframe content isn't in JS. The iframe content is regular html:
My Webpage .

This post has been edited by P6tu: Mar 18 2017, 01:03 PM