YouTube video handling

I would like to create a page that shows the latest YouTube video, with links underneath that when clicked change the current YouTube video being shown and loads the one being clicked.

I was thinking that perhaps this could be done by creating a new post for each video, and putting the YouTube embed code in a custom field.

But that’s where I get stuck, how do I create that feature of clicking the link and it loads a different posts custom field without leaving the page. I’m guessing this could be done with java? If you know how, your help would be greatly appreciated.