load content in same page

hello friends,

im looking for plugin or hack to load content on same page without creating page or post.
bit hard to explain.
i want something like this – https://i41.tinypic.com/16joqdl.jpg
can you guide me how to do this?

basically i want to add few games to my WP site.when a user clicks on below thumbnail, the game should load on top.

thanks