get the value of all selected checkboxes in textbox

I am trying to create a check box with some value and then display the values of selected check boxes separated by a comma.

I can create a checkbox but I am unable to display the values in a text box. Please help.

http://ift.tt/1btO03Z

function displayCheckbox(){    
    $("input:checkbox").change(function() {          
        selectedCB = [];
        notSelectedCB = [];
        $("input:checkbox").each(function() {
            if ($(this).is(":checked")) {
                CountSelectedCB[0] = $(this).attr("id");
            }
        });
        $('input[name=selectedCB]').val(CountSelectedCB); 
    });
}