register_widget_control( 'JQuery Accessible Checkbox', 'JQueryAccessibleCheckbox_control', 200, 200 ); if ( !is_admin() && is_active_widget('widget ...

2) Automatic uncheck master checkbox if any of given (slave) checkbox is unchecked. 3) Automatic check the master checkbox if all the slave checkboxes are checked. In Brief, Check all the check boxes ...