[jQuery] How to add a CSS Class to this

[expresso]

I'm new to JQuery.  I know you can add a CSS class to an element.  But
here, it's sort of tricky for this one.

    $(function(){
            updateSettingsForForm1ValidationSet($('#form1').validate({
                    errorPlacement:function(error,element){
                            error.appendTo(element.parent("td").next("td"));
                    },
                    rules:{}
            }));

I figured maybe I could just append an addClass after the
element.parent("td").next("td") but not sure if that's correct and
then where and how to define the class itself.  Does that go inside
the function or outside.  I assume outside.