Problem with datepicker and ajax post

var events = [ 
{ contestdate: new Date('03/26/2013') },{ contestdate: new Date('03/25/2013') },{ contestdate: new Date('03/31/2013') },{ contestdate: new Date('03/29/2013') },];



$( ".contestpicker" ).datepicker({ 
		autoSize: true,
		numberOfMonths: 1,
		minDate: 0,
		beforeShowDay: function(date) {
        var result = [true, '', null];
        var matching = $.grep(events, function(event) {
            return event.contestdate.valueOf() === date.valueOf();
        });
        
        if (matching.length) {
            result = [true, 'highlight', null];
        }
        return result;
    },
    onSelect: function(dateText) {
        var date,
            selectedDate = new Date(dateText),
            i = 0,
            event = null;
        
        
        while (i < events.length && !event) {
            date = events[i].contestdate;

            if (selectedDate.valueOf() === date.valueOf()) {
                event = events[i];
            }
            i++;
        }
        if (event) {
            $.post("assets/db/contest.php?contestdate=" + event.contestdate + "");
        }
    }
	});	

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