[Pro] Original window "darkens" during new window

Freeway
1

How do you create the effect where a new smaller window opens (on a click) and the original window is still seen behind but “darkened”? Example- http://www.impliedbydesign.com/ click on contact box on right.
Thanks.

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2

This is a “lightbox” effect. There is an action for this here: http://www.coastalrugs.com/Actions/misc.actions.html

Lightbox Image is the name of the action.

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