[Javascript] Getting object property names as a string

[ryan at ryancannon.com (Ryan Cannon)]

Greetings, this feels like a silly question, but I'm looking for a  
way to access an object's property names as a string. For example:

var test = { foo: 'bar' };
alert(test.foo) // alerts 'bar'

how do I alert('foo') ?
-- 
Ryan

http://RyanCannon.com/