Calendar.setup({
        inputField     :    "arrivo",     // id of the input field
        ifFormat       :    "%B %e, %Y",      // format of the input field
        button         :    "btn_arrivo",  // trigger for the calendar (button ID)
        align          :    "Tl",           // alignment (defaults to "Bl")
        singleClick    :    true
    });
	
	    Calendar.setup({
        inputField     :    "partenza",     // id of the input field
        ifFormat       :    "%B %e, %Y",      // format of the input field
        button         :    "btn_partenza",  // trigger for the calendar (button ID)
        align          :    "Tl",           // alignment (defaults to "Bl")
        singleClick    :    true
    });