document.observe('dom:loaded', function() {
  $$('.drop').each(function(element) {
    new Tip(element.up().down(), element, {
      viewport: true,  
      radius: 0,
      border: 0,
      hideOn: false,
      hideAfter: 0.2,
      hook: { target: 'leftBottom', tip: 'topLeft' }
    });
  });
});