IE8 not initializing function properties in javascript.

I have the following javascript. This extends keith woods jquery date picker. In chrome, ff the following alerts a date value. However in ie 8 i get [object, object]

is there something obviously that breaks in ie8 that works in chrome and firefox

<script type="text/javascript"><!--
var defaultDate = '06/01/2011';

$(function() {

    $('#inlineDatepicker').calendarsPicker({onSelect: showDate, defaultDate: defaultDate, selectDefaultDate: true, changeMonth:false, onDate: nationalDays, prevText: '&nbsp;',  nextText: '&nbsp;'});


function nationalDays(date, inMonth) { 

    alert(date); // doesn't return date in ie 8

function showDate(date) {   
    var start = date.toString('dd-MM-yyyy');
    var url = '/events?s=' + start;
    window.location = url;


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any a link to provide to see it in live?
Michel PlungjanIT ExpertCommented:
Try alert(date.toString())

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