gistfile1.rb

  <%= link_to_remote("Kalendář", 
        {:url => calendar_path, :method => 'get', :loading => 'Aplication.Calendar.loading()', :complete => 'Aplication.Calendar.loaded()'},
        {:href => calendar_path, :class => 'calendar-link'})  
  %>

gistfile2.js

  Calendar : {
  	show : function() {
  	  $('body').addClassName('has-calendar')
  	  $('body').addClassName('calendar')
  	  $('calendar-shadow').hide()
  	  Effect.Appear('calendar-shadow', {duration:0.3, to:0.8})
  	},
  	hide : function() {
  	  $('body').removeClassName('has-calendar')
  	  $('calendar').remove()
  	  $('calendar-shadow').remove()
      // Effect.Fade('calendar-overlay', {duration:0.4})
      // try { $('calendar-overlay').remove.delay(0.5) } catch(e) {}
  	},
    loading : function() {
      $$('.calendar-link').addClassName('loading')
    },
    loaded : function() {
      $$('.calendar-link').removeClassName('loading')
    },