Jee, I hate browsers! Almost all of them, anyway...
When I first saw your image I thought, good grief, what did she do to that picture? Then I dragged it onto the desktop because I wanted to try a few things with it... What a surprise!
Here's a little screenshot, showing what Firefox (colour space blind, on the left) and Mac OSX Preview (colour space aware) will make of your image:
It turns out that the image you posted is in ProPhoto RGB. Web browsers (with the exception of Safari and IE for Mac,
AFAIK) will render it as sRGB. I've heard rumours that Firefox 2 will understand colour spaces, almost too good to be true...
There you go.
Cheers
Steffen.