Can I make this example site in iWeb? :)

sure, all in iweb and not even using flash.

http://iwebwidgets.cyclosaurus.com/AutoSlideshow/AutoSlideshow.html

Here's how I do it :

http://www.wyodor.net/_Demo/MyHouse/Huis.html

Explanation here :

http://www.wyodor.net/iWebBlogTest/Wyodor_1/WebBanner.html

And there are thousands of similar slideshows.

Find them, make them work and then display them in a HTML Snippet with the <iframe> HTML element :

http://www.wyodor.net/blog/archives/2011/08/entry_321.html

And browse this forum. It's often asked and answered.

Some examples of different banners and slideshows created in iWeb...

http://www.iwebformusicians.com/Banner-Slideshow/Banners.html

http://www.iwebformusicians.com/Banner-Slideshow/Slideshow-Showcase.html

A dual slider with both text and image...

http://www.iwebformusicians.com/iweb-snippets/map-tutorial.html

In the near future, javascript will not be required since CSS transitions are now being supported in most browsers...

http://www.iwebformusicians.com/iweb-snippets/flux.html

My iWeb monstrosity:

http://jeffnitschke.com/Home.html

You can do quite a bit with iWeb with a little effort.

Not a problem.