HTML

<div id="form'" style="display:none" title=""></div>

Jquery on DOM ready

$('#form').dialog({
    modal: true,
    buttons:
    { "Cancel": function() {
      $(this).dialog("close")
    },
      "Submit": function() {
      //put code here for form submission
    }

    //버튼 여기에 추가 가능
  });

$("#form'").dialog('open');