Get the real width and height of an image with JavaScript? (in Safari/Chrome)

Question

I am creating a jQuery plugin.

How do I get the real image width and height with Javascript in Safari?

The following works with Firefox 3, IE7 and Opera 9:

Answer 1

What about image.naturalHeight and image.naturalWidth properties?

Seems to work fine back quite a few versions in Chrome, Safari and Firefox, but not at all in IE8 or even IE9.