jQuery - disable/enable select options

Question

I need some help with jquery if condition. I\'ve been searching and testing for hours, any help would be great !!! I get this HTML code:

Answer 1

try this:

$(function(){
    $("input").change(function(){
        if ( $(this).val() < 3 ) {
            $('#select2').prop('disabled', true);
            $('#select1').on("change",function() {
                $('#select2').val($(this).val());
            });
        }else {
            $("#select1").off();
            $('#select1, #select2').prop('disabled', false);
        }
    });
});

Demo:http://jsfiddle.net/qhPp7/2/