Bukkit

Javascript {js} can now execute javascript files.
Example:
use {js:test.js}
test.js can be found in the "script" folder inside the InSignsPlus plugin folder.
Feel free to add your own scripts and execute them.

One thing to keep in mind is that executing javascript from a file takes a lot longer than preconfigured placeholders.
This doesn't mean you shouldn't try it out, just don't expect more than 1000 signs using javascript to update hastle free.