I am using json to receive data. Now I have tested with all browsers, working fine except IE. In ie I am getting undefined null object error. can any one help me with this please? here is my code

2. function exchangeIdentifier() {
3.        $.getJSON('exchangedetail.php', {countryName:$('#countryName').val()}, function(data) {
4.         var select = $('#exchange');
5.         var options = select.attr('options');
6.         $('option', select).remove();
7.         $.each(data, function(index, array) {
8.             options[options.length] = new Option(array['exchange']);
9.         });
10.    });
11. }
12. function equityIdentifer() {
13.        $.getJSON('equitydetail.php', {exchange:$('#exchange ').val()}, function(data) {
14.         var select = $('#typeo');
15.         var options = select.attr('options');
16.         $('option', select).remove();
17.         $.each(data, function(index, array) {
18.             options[options.length] = new Option(array['eqtype']);
19.         });
20.    });
21. }