I am designing a program that adds and removes text highlighting based on the clicking of a button. 

My program works the first time through, i.e. click once highlighting turns on, click twice highlighting turns off, but after that the clicking does not trigger anything. What am I doing wrong?

Sample code can be found here using jQuery 2.2.3:

https://jsfiddle.net/deanc1983/fyfusboe/#&togetherjs=mGIo5lAvM9