[jQuery] select.append() works in FF 2 not in IE 7

[jQuery] select.append() works in FF 2 not in IE 7


I want to populate a select. This works perfectly in Firefox 2 but not
in IE 7:
var sel_modelo = $('select#modelo_id');
sel_modelo.empty();
for (var i = 0; i < json.rs_modelo.length; i++)
sel_modelo.append(new Option('text', 'value'));
Any hints?
Regards, Clodoaldo