Obfuscate/change some public Javascript code

I have some public JS code (to make a select menu responsive) that I'm using in a private project that disallows use of this public code. The relevant JS is here: [login to view URL] It is around 100 lines of code. Note: I want it still to be human-readable, just with the variable/function names changed, bits swapped etc etc. It should (obviously) retain 100% of the same functionality.