Change Keyboard Layout thru Powershell 3

Hi,

I would need a PowerShell script to change my keyboard layout. I have in Windows installed Finnish, English (United States) and Russian layouts and I would need a simple function that takes one parameter, the language, and either changes the language or returns some kind of an error. Any help is appreciated.

I'm using Windows 7 and PowerShell 3.0

Thank you in advance!