function cal_setup() {
	Calendar.setup({
        inputField     :    "date",      // id of the input field
        ifFormat       :    "%d/%m/%Y",       // format of the input field
        showsTime      :    false,            // will display a time selector
        button         :    "date_calendar",   // trigger for the calendar (button ID)
        singleClick    :    true,           // double-click mode
        firstDay       :    1,           // double-click mode
        step           :    1                // show all years in drop-down boxes (instead of every other year as default)
    });
}