[jQuery] DWR + jQuery validation plugin

[jQuery] DWR + jQuery validation plugin


Hi,
Please advise, how it is possible to integrate DWR (Direct Web
Remoting http://getahead.org/dwr/) into JQuery validation?
I need to validate if such username is already existed in database
(ajax validation)
I was trying to do it in this way:
1)create dwr function
function isUsernameExisted(username){
        var id = $j('#id').val();
        DWRUserManager.isUsernameExisted(username, id, {
             callback:function(dataFromServer){
             if(dataFromServer!="<c:out value="${SUCCESS_VALIDATION_MESSAGE}" /