Parameters with Ajax

Question

hello, I’m trying to go through parameters with variables information of two Dropdown fields, but I’m not able to use two variables, when I use only one with you normally. following example:

$(function(){
$('#alerta_cor').hide();
$('#id_cod_item').change(function(){
if( $(this).val() ) {
$('#cor_prod').hide();
$('#alerta_cor').show();
$.getJSON('select_cor_prod.php?search=',{id_cod_item: $(this).val(), ajax: 'true'}, function(j){
var options = '<option value="">Escolha a Cor</option>';
for (var i = 0; i < j.length; i++) {
options += '<option value="' + j[i].id_cor + '">' + j[i].desc_cor + '</option>';
}
$('#id_cor_prod').html(options).show();
$('#alerta_cor').hide();
});
} else {
$('#id_cor_prod').html('<option value="">– Escolha o produto –</option>');
}
});

the problem is when I try to pass two variables does not present the information, ie does not work, I do not have much skill with ajax, so I believe I am doing something wrong in the declaration of variables. Below follows the line I changed to load two variables, they are id_cod_item and situaca_prod.

$.getJSON('select_cor_prod.php?search=',{id_cod_item: $(this).val(), situacao_prod: $(this).val(), ajax: 'true'}, function(j){

if anyone can guide what I’m doing wrong I appreciate.

att Ebert