Jquery validation by class

Hello experts.
I need help to validate a form in a modal window by classname using jquery validation plugin.
My form is  id="formcategories"
My required textfields : class="categoryclass"

If one of the textfields doesn't pass the validation - add to this class error (like i would handle this with id validation)
Attached my code
var editcategory = function(id){
    var p = $("#popuploader");
        autoOpen: false,
        width: 300,
        height: 300
       buttons: {
            "Save": function () {
                var targetUrl = "index.cfm";
                var b = $("#formcategories");
                var a = b.valid();
                if (a) {
                    var f = b.serialize();
                    $.post("actions/actupdate.cfm", f, function (g) {
                        if (g) {
							window.location.href = targetUrl;
            "Cancel": function () {
	p.load("forms/frmtext.cfm?categoryid=" + id, function (c, e, d) {
            if (e == "success") {
            } else {

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Any help?
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This will will add the rule "required" to all fields of class "categoryclass":

  categoryclass: {
    required: true

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you can add more rules inside that.

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PanosAuthor Commented:
Hi designatedinitializer
where do i have to place this code inside my script so that the form will be validated on:
var a = b.valid();
PanosAuthor Commented:
Finally i got it.
Thank you for your help
PanosAuthor Commented:
thank you
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