JQuery :: Validate - Variation Of Mulitpage Forms

I am using a variation of the multipage form in the demo and run into a small problem with the pageRquired function. Seems it does not validate correctly if you add any custom selectors after the pageRequired. I am trying to make one field required depending on whether another field is blank. E.g.:
class="{pageRequired: '#field1:blank'}"

In this case, the validation is completely ignored, even if I have {pageRequired:true}. It will only validate if I have class="pageRequired" without the curly brackets. However, if I set it up in rules, it will make the field2 required regardless of the value of field1, e.g.: $(document).ready(function(){
$("#myform").validate({
rules: {
field2: {
pageRequired: "#field1:blank"
}}, debug:true
});

On a whole the multipage validation works very well but not with any custom selectors such as :blank, :filled etc or by using curly brackets in the class. Is there a way around this? I would really prefer to use inline validation using class statements and still be able to use custom selectors. View this message in context: [URL].