Calendar.setup({
		inputField     :    "check_in",     
		ifFormat       :    date_format,     
		button         :    "check_in_btn",  
		align          :    "BR"
	});
	Calendar.setup({
		inputField     :    "check_out",     
		ifFormat       :    date_format,     
		button         :    "check_out_btn",  
		align          :    "BR"
	});