function clearDates() {
	var F = document.search_tools_form;
	F.date_from.value = '';
	F.date_until.value = '';
}


function calendarSetup(field_id, button_id) {
	if (button_id == "") { button_id = field_id; }
	Calendar.setup({
		inputField     :    field_id,      // id of the input field
		ifFormat       :    "%m/%d/%Y",// - %I:%M %p",       // format of the input field
		showsTime      :    false,            // will display a time selector
		timeFormat		:	12,
		button         :    button_id,   // trigger for the calendar (button ID)
		singleClick    :    false,           // double-click mode
		step           :    1                // show all years in drop-down boxes (instead of every other year as default)
	});
} // end calendarSetup