How to build a curved menu with jQuery UI (or other Javascript library)?

Is there a jQuery UI plugin (or other Javascript library) to build a curved-开发者_JS百科menu like Stacks in OS X or a flow menu?

Or, how would one accomplish this with CSS and JavaScript alone (assuming I can do the math)? Is this possible through DOM manipulation, or does it require something like WebGL?

EDIT: I'll also accept other fancy menu effects offered by jQuery plugins, if they're reasonably awesome looking.

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You can do it using HTML5 . See these examples http://html5example.net/entry/examples/html5-examples-and-demos-collection-1
see pi-menu example

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The stack's on this page are very close to what I'm seeking.