Hi Ella - which version of MoI are you trying it on?

I just tried it over here with the latest v2 beta (Apr-12-2009 release) and it seems to work fine for me.

You mentioned the "ConstructionLine.js" script - do you mean you only have that one file? There should be 2 files included in the .zip, a .js file and an .htm file.

You'll need to copy both of those files (not just the .js file) to your \commands sub-folder, then set up a shortcut key that says: ConstructionLine as the command.

Let me know if you've done all that and still have problems.

- Michael