Calendar.setup({
	inputField     :    "date_arriv",      // id of the input field
	ifFormat       :    "%d/%m/%Y",       // format of the input field
	showsTime      :    false,            // will display a time selector
	button         :    "trigger1",   // trigger for the calendar (button ID)
	singleClick    :    false,           // double-click mode
	step           :    1                // show all years in drop-down boxes 
});
Calendar.setup({
	inputField     :    "date_depart",      // id of the input field
	ifFormat       :    "%d/%m/%Y",       // format of the input field
	showsTime      :    false,            // will display a time selector
	button         :    "trigger2",   // trigger for the calendar (button ID)
	singleClick    :    false,           // double-click mode
	step           :    1                // show all years in drop-down boxes 
});