[jQuery] remote validation

[MartinBorthiry]

Hello:
  I'm using the validation plugin on my site to make remote
validations, and it is working graet!
  But, I note that the ajax call is made allways. I think that that
call only has to be done when the input value has changed. Has no
sense to validate a value which has not changed.

 It is posible to specify into the rule's options that only validate
if the value has changed?

 My code:

$('#number').rules('add',{
                remote: {
                url: "/api/validate/number/",
                data: { val: $('#number').val()}
               }})