any
}

var createDialog = function(div){
  var html = '<p>' + ui_utils.generateWords(4,8) + '</p>';
  div.append(html);

  $('#dialog').dialog({ height: 70, position: {my: 'center', at: 'center', of: document.getElementById('area')} });

  $('.ui-dialog')[0].style.margin = core.randi(-10,20) + 'px ' + core.randi(5,25) + 'px';
  $('.ui-dialog')[0].style.width = core.randi(90,120) + 'px';
  $('.ui-dialog')[0].style.height = core.randi(70,100) + 'px';
}

var genProblem = function() {  
  // init: click dialog 