[jQuery] Error $.ajax on IE

[jQuery] Error $.ajax on IE


Hi People!
This my code, sorry my stupid english! rs..
$.ajax({
contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
url: "cad_produto.do.php",
type: "post",
data: dados,
success: function(msg) {
    $('#busca').html(msg);
}
});
I don't understand because it does not work in IE. In Firefox works
normally.
The error is reported: "Object Required" on the line that does not
exist.