Blue toning?

Any ideas how to get the blue tone like in this picture, while maintaining the true whites and blacks?

It's a Javascript window, so following the following for a link --
http://www.agwpja.com/
Scroll down
Click "First place" under "Engagement portrait"

Thanks!

That greenish toning is created by cross processing the photo.
I think if you search for 'cross process tutorial' on google you'll find tons of information. There are some filters out there that help you getting the same effect.

I've applied tones like this by the following method...
add new layer above image..
fill layer with colour of choice..
change the layers blending mode to overlay.

that's it.

The cross-processing worked great. I haven't tried the second option yet, but thanks for all the input!

You are welcome!
If you need more help with photos or graphics, you know where to look...