Scusa Vindav... ma non ho capito cosa mi vuoi dire.. io ho questo codice jquery.validate.js
(function($) {

$.extend($.fn, {
// http://docs.jquery.com/Plugins/Validation/validate
validate: function( options ) {

// if nothing is selected, return nothing; can't chain anyway
if (!this.length) {
options && options.debug && window.console && console.warn( "nothing selected, can't validate, returning nothing" );
return;
}

// check if a validator for this form was already created
var validator = $.data(this[0], 'validator');
if ( validator ) {
return validator;
}

validator = new $.validator( options, this[0] );
$.data(this[0], 'validator', validator);

if ( validator.settings.onsubmit ) {

// allow suppresing validation by adding a cancel class to the submit button
this.find("input, button").filter(".cancel").click(function() {
validator.cancelSubmit = true;
});

// when a submitHandler is used, capture the submitting button
if (validator.settings.submitHandler) {
this.find("input, button").filter(":submit").click(function() {
validator.submitButton = this;
});
}

// validate the form on submit
this.submit( function( event ) {
if ( validator.settings.debug )
// prevent form submit to be able to see console output
event.preventDefault();

function handle() {
if ( validator.settings.submitHandler ) {
if (validator.submitButton) {
// insert a hidden input as a replacement for the missing submit button
var hidden = $("<input type='hidden'/>").attr("name", validator.submitButton.name).val(validator.submitB utton.value).appendTo(validator.currentForm);
}
validator.settings.submitHandler.call( validator, validator.currentForm );
if (validator.submitButton) {
// and clean up afterwards; thanks to no-block-scope, hidden can be referenced
hidden.remove();
}
return false;
}
return true;
}

// prevent submit for invalid forms or custom submit handlers
if ( validator.cancelSubmit ) {
validator.cancelSubmit = false;
return handle();
}
if ( validator.form() ) {
if ( validator.pendingRequest ) {
validator.formSubmitted = true;
return false;
}
return handle();
} else {
validator.focusInvalid();
return false;
}
});
}

return validator;
},
// http://docs.jquery.com/Plugins/Validation/valid
valid: function() {
if ( $(this[0]).is('form')) {
return this.validate().form();
} else {
var valid = true;
var validator = $(this[0].form).validate();
this.each(function() {
valid &= validator.element(this);
});
return valid;
}
},
// attributes: space seperated list of attributes to retrieve and remove
removeAttrs: function(attributes) {
var result = {},
$element = this;
$.each(attributes.split(/\s/), function(index, value) {
result[value] = $element.attr(value);
$element.removeAttr(value);
});
return result;
},
// http://docs.jquery.com/Plugins/Validation/rules
rules: function(command, argument) {
var element = this[0];

if (command) {
var settings = $.data(element.form, 'validator').settings;
var staticRules = settings.rules;
var existingRules = $.validator.staticRules(element);
switch(command) {
case "add":
$.extend(existingRules, $.validator.normalizeRule(argument));
staticRules[element.name] = existingRules;
if (argument.messages)
settings.messages[element.name] = $.extend( settings.messages[element.name], argument.messages );
break;
case "remove":
if (!argument) {
delete staticRules[element.name];
return existingRules;
}
var filtered = {};
$.each(argument.split(/\s/), function(index, method) {
filtered[method] = existingRules[method];
delete existingRules[method];
});
return filtered;
}
}

var data = $.validator.normalizeRules(
$.extend(
{},
$.validator.metadataRules(element),
$.validator.classRules(element),
$.validator.attributeRules(element),
$.validator.staticRules(element)
), element);