Event.observe(window, 'load', function() {
    if ($('id_phone_number'))
        if (location.href.split('?')[1] != null)
            if (location.href.split('?')[1].split('=')[1] != null)
                $('id_phone_number').value = location.href.split('?')[1].split('=')[1];

    if ($('id_date'))
		Calendar.setup({dateField: 'id_date', triggerElement : 'id_date'});
});