https://pqfans.com/wp-content/plugins/nix-gravatar-cache/js/main.js?ver=7.0.7

1jQuery(document).ready(function($) {
2	var active = $('.gravatar_cache_form input[type=checkbox]');
3	var input  = $('.gravatar_cache_form input[type=text]');
4
5	if ( active.prop('checked') != true ) {
6		input.each(function() {
7			$(this).attr('readonly','readonly').addClass('disabled-input');
8		})
9	}
10
11	active.click(function(){
12		if ( $( this ).prop('checked') != true) {
13			input.each(function(){
14				$(this).attr('readonly','readonly').addClass('disabled-input');
15			})
16		} else {
17			input.each(function(){
18				$(this).removeAttr('readonly').removeClass('disabled-input');
19			})
20		}
21	})
22});