[jQuery] Validate remote method don't work

[jQuery] Validate remote method don't work


Hi,
I've try to use remote method and not work.
There are the parameters
<script type="text/javascript">
$(document).ready(function(){
var validator = $("#formcode").validate({
rules: {
codigo: {
required: true,
minlength: 3,
remote: "valcodigo.php"
}
},
errorPlacement: function(error, element) {
error.insertAfter(element);
},
messages: {
codigo: {
remote: jQuery.format("El código {0} ya existe")
}
},
errorClass: "errores"
})
})
</script>
The form
<div id="form">
<form id="formcode" name="formcode" method="post" action="<? echo
$PHP_SELF?>?p=<?echo $modulo?>&acc=grabar" class="cmxform">
    <fieldset>
     <label for="codigo">Código</label>
     <input type="text" name="codigo" id="codigo" class="input" /><br />
</fieldset>
<input class="submit" type="submit" value="Grabar" />
</form>
The remote script
<?php
$request = trim(strtolower($_REQUEST['value']));
$codigo= array('A1234','B1234');
$valid = 'true';
foreach($codigo as $cod) {
    if( strtolower($cod) == $request ) {
        $valid = 'false';
    }
}
echo $valid;
?>
required and minlenght work fine but remote don't
I've download the entire "Milk" demo and I've copy it in my local
server and remote method don`t work too.
Anybody help me???
Thanks
Adrian