location.hash - windows or document?

[stevio]

I am wanting to use the location.hash value in my JavaScript as I am implementing Ajax. However, should I use:
window.location.hash
or
document.location.hash
or just
location.hash
?

Which is most compatible and best to use?

Thanks,
Stephen

[A1ien51]

window.location is the safer of the two.

In some browsers [I do not think anything modern], document.location was read-only.

Eric