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You need to (manually) install the NppScripting plug-in by Kremer Eugen (http://www.softwarecanoe.de/data/nppscripting.zip) and copy the lineinserter.js file into the "includes" folder for that plug-in.
I wanted to make it prompt for the text to insert, but there isn't a good API in the NppScripting plug-in for doing so. I tried the provided Dialog class, but the IE window wouldn't open with focus on Windows 7. Any ideas on how to prompt the user for input?