Custom Global Functions

Basically my question here is....

Is there a way to make a javascript file that just hold personal functions that I've created for my game. I'm making quite a few functions that would be nice to access from other scripts, but I'd rather not have to keep adding that function to each file. So is there a way to make one file that holds all my functions and just include it?

In a previous game engine there was a #include "script name" and functions from that would be implemented into the new script. This made it easy to keep clean and reuse functions.

Thanks

Yes, you can use a static function. See this question:

When should i use static functions?