private void chk_userStateChanged(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_chk_userStateChanged
        //request offline users
        //if (chk_user.isSelected() == true) {
        //    cl.out.print("/getofflineUser");
        //}
        //if (chk_user.isSelected() == false) {
        //    cl.out.println("/getonlineUser");
        //}
    }//GEN-LAST:event_chk_userStateChanged