MooTools.Floor was nice enough to post documentation for the class, though there’s a lot of options to go through.

Errors appear in tools tips, form submission via ajax is available, error messages can be customizable, the options are endless! Like I said, there are lots of options.

To set whether an input, textarea, or select element needs to validate, you give the element a class property:

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<input type="text" class="validate['required','length[4, -1]','differs[email]','digit']" name="test_field" value="" />

To set up a form, you instantiate the MooTools class:

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var myCheck = new FormCheck('form_id', {
    tipsClass : 'tips_box',
        display : {
            scrollToFirst : false
        },
        alerts : {
            required : 'This field is ablolutely required! Please enter a value'
        }
});