Check if any checkbox in form is checked (MooTools)

I'm using a form with various checkbox groups and I would like the next button at the bottom of the page to appear only if any of the checkboxes is checked.

I found a working solution using jQuery here:

var checkboxes = $("input[type='checkbox']"),
submitButt = $("input[type='submit']");

checkboxes.click(function() {
submitButt.attr("disabled", !checkboxes.is(":checked"));
});

http://ift.tt/1DVMEqG

I'm looking for a way to do this with MooTools and I would prefer a solution where the button state is not "disabled" but hidden via CSS.