link text change

Hello, Thank you very much for the plugin, it works very nicely on my site. How difficult would it be to modify the javascript so that the text can change when expanded / reduced. That is, like the script https://github.com/viralpatel/jquery.shorten . Ideally I wish to display “more” and “less”. I am not very experienced with javascript so not sure how to modify your plugin. Thanks for any help. https://wordpress.org/plugins/expandcollapse-funk/