[jQuery] jQuery Validate -- how to require series of checkboxes when named as array[]

[ripcurlksm]

I have a working example of jQuery validate working in the link below.
The newsletter checkbox is required and working. However, the "colors"
checkboxes are all named as an array ( ex: name="color[]" ), and so
the problem lies in the validation code, where it uses the name of the
element to require elements ( ex: newsletter: "required" ).

$("#testform").validate({
        rules: {
                // how do i name colors below?
                // colors[] ???
                // fieldset#color_preference input:checkbox  ???
                colors: {
                        required: true,
                        minlength: 1
                },
                newsletter: "required"
        },
        messages: {
                colors: "*Required",
                newsletter: "*Required"
        }
});

Here is an example:
http://psylicyde.com/misc/jquery-validate/demo/test-checkboxes.php