window.addEvent('domready', function(){
  if($$('.modal-overlay')){
    $$('.modal-box .close').addEvent('click', function(){
      $$('.modal-overlay').setStyle("display","none");
      $$('.modal-box').setStyle("display","none");
    });
  };
  if($$('.modal-overlay')){
    $$('.modal-overlay').addEvent('click', function(){
      $$('.modal-overlay').setStyle("display","none");
      $$('.modal-box').setStyle("display","none");
    });
  };
});