Checkbox - Jquery - Check All / Select All

http://www.iknowkungfoo.com/blog/index.cfm/2008/7/9/Check-All-Checkboxes-with-JQuery

 

            $("#ChkAllOffice").click(function() {

                var checked_status = this.checked;

                $("input[id*='ChkOffice']").each(function() {

                    this.checked = checked_status;

                });

            });