What is this chart called? How do I reproduce it in a web browser?

Question

I'm perfectly aware this is a google away. Unfortunately I don't know the name of the chart I'm looking for. So I'm unable to make a reasonable search for plugins or API's. Please be kind.

What is this type of charts called?

What i want to do: Draw a chart similar to below in a webbrowser, given input as a list of "sizes". Preferably with a jquery plugin or javascript API.

In the image below the sizes happens to be Disk-sizes.

Answer 1

It is a Treemap chart. You can use Google's API to recreate it on the web:

http://code.google.com/apis/chart/interactive/docs/gallery/treemap.html