<script type="text/javascript">
                            $(function () {
                                $("#first, #second, #persons, #table, #date, #time, #number, #email").bind("change keyup",
                          function () {
                              if ($("#first").attr('checked') == true && $("#second").val() != "")
                                  $(this).closest("form").find(":submit").removeAttr("disabled");
                              else
                                  $(this).closest("form").find(":submit").attr("disabled", "disabled");
                              });
                                });