How to open silverlight download under mountain lion

I had to clear my cookies for Netflix and am trying to install Silverlight to run streaming movies.  Netflix downloads the Silverlight package, but when I try and open it, I get an error message that it can't be opened because it is from an unidentified developer.  I know it is something under my security prefs, but I can't remember how to do it.
Help!

It's the Gatekeeper settings in the Security system preference, but you don't have to change the settings. Right-click (or control-click) the installer and select "open". You'll get a message asking if you want to open it. If you're sure this package is valid, allow it to open.
Regards.

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