I was watching movies on youtube, and then when I came to the frontpage, it showed a lot of different users, which movies I have watched.. Then I could click on one of them and a black overlay showed up with a bow containing a few of their movies..

I was surprised, that when I looked in the script, there was no iframe.. but neither there seemed to be any ajax communication.. it was extremely fast and responsive and it didn't have to reload anything... There was no loading bar or anything... just click, and show...

My question is:
Does anybody know about this scripting method? Is it just a normal jQuery .load command or how? it seems really complex but I really want to learn it..

I would have attached a screenshot if it was possible, but I hope, that you may know what I am talking about or be able to figure out how to see it on youtube..