I have this code

 $('#Submit').click(function(event) {
            var checked = $('.inputchbox'); ......IE8
            var ids= checked.map(function() {
                return $(this).val();
            }).get().join(',');
             alert(ids);
        });

This Code return all the values which is there for Checkboxbox (.inputchbox is class for the checkbox)

but If I give somethign like this

var checked = $('.inputchbox input:checkbox:checked');
or
var checked = $('.inputchbox input[type=checkbox]:checked');
or
var checked = $('.inputchbox input[name=chk]:checked');
or 
var checked = $('.inputchbox').find('input[type=checkbox]:checked');

if i am giving like this nothing is working for me I am not getting the result in IE8?

 var checked = $('.inputchbox'); .....this is working but I am getting the checkboxes ids its doesnot checking wheather its checked or not.. 

I need to get only checked chekcbox id's

thanks