
Copy folder "BGSwitcher" to you scripts directory 
As usually it is located in C:\Program Files\Autodesk\3ds Max 2011\Scripts

Copy contain of "Icons Folder" to YOUR_HARD_DRIVE\Program Files\Autodesk\3ds Max 2011\ui\Icons
After run 3D Max and run the script, you will find it in category "BGSwitcher"


-----------------!!!NOTE!!!---------------------------------------
If 3d max is instaled in another hard disk you need to edit script 
Find in line 69 

	bitmapPath = "C:\Program Files\Autodesk\3ds Max 2011\Scripts\BGSwitcher\\"

and insert path to you script directory
	
	bitmapPath = "PATH_TO_YOU_SCRIPT_DIRECTORY\BGSwitcher\\"
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Thank you