PrettyDate in stile YouTube

[Protooler]

Buongiorno a tutti!
Vorrei stampare una data con il metodo prettydate in stile youtube ma ho difficoltà ad integrare queste due funzioni:

$.ajax({
	url: 'http://gdata.youtube.com/feeds/api/videos/'+videolink+'?v=2&alt=json', dataType: "jsonp", success: function (data) {
		getComments(data.entry.gd$comments.gd$feedLink.href + '&max-results=50&alt=json', 1);
	}
});

function parseresults(data) {
    getComments(data.entry.gd$comments.gd$feedLink.href + '&max-results=50&alt=json', 1);
}

function getComments(commentsURL, startIndex) {
	$.ajax({
		url: commentsURL + '&start-index=' + startIndex,
		dataType: "jsonp",
        success: function (data) {
        $.each(data.feed.entry, function(key, val) {
        	$('#comments').append('<span class="author">' + val.author[0].name.$t + '</span>
<span class="comment">' + val.content.$t + '</span>
<span class="time">' + val.published.$t + '</span>

');
		});
	});
}

in grassetto il valore (al momento è in questo formato "2011-10-12T09:23:28.000Z") che vorrei trasformare utilizzando la funzione qua sotto..

function prettyDate(date_str){
	var time_formats = [
	[60, 'just now', 1], // 60
	[120, '1 minute ago', '1 minute from now'], // 60*2
	[3600, 'minutes', 60], // 60*60, 60
	[7200, '1 hour ago', '1 hour from now'], // 60*60*2
	[86400, 'hours', 3600], // 60*60*24, 60*60
	[172800, 'yesterday', 'tomorrow'], // 60*60*24*2
	[604800, 'days', 86400], // 60*60*24*7, 60*60*24
	[1209600, 'last week', 'next week'], // 60*60*24*7*4*2
	[2419200, 'weeks', 604800], // 60*60*24*7*4, 60*60*24*7
	[4838400, 'last month', 'next month'], // 60*60*24*7*4*2
	[29030400, 'months', 2419200], // 60*60*24*7*4*12, 60*60*24*7*4
	[58060800, 'last year', 'next year'], // 60*60*24*7*4*12*2
	[2903040000, 'years', 29030400], // 60*60*24*7*4*12*100, 60*60*24*7*4*12
	[5806080000, 'last century', 'next century'], // 60*60*24*7*4*12*100*2
	[58060800000, 'centuries', 2903040000] // 60*60*24*7*4*12*100*20, 60*60*24*7*4*12*100
	];
	var time = ('' + date_str).replace(/-/g,"/").replace(/[TZ]/g," ").replace(/^\s\s*/, '').replace(/\s\s*$/, '');
	if(time.substr(time.length-4,1)==".") time =time.substr(0,time.length-4);
	var seconds = (new Date - new Date(time)) / 1000;
	var token = 'ago', list_choice = 1;
	if (seconds < 0) {
		seconds = Math.abs(seconds);
		token = 'from now';
		list_choice = 2;
	}
	var i = 0, format;
	while (format = time_formats[i++])
		if (seconds < format[0]) {
			if (typeof format[2] == 'string')
				return format[list_choice];
			else
				return Math.floor(seconds / format[2]) + ' ' + format[1] + ' ' + token;
		}
	return time;
};

Come posso fare per risolvere questo problema?
Ciao e grazie anticipatamente!

[Vindav]

<span class="time">' + prettyDate(val.published.$t) + '</span>

[Protooler]

Grazie Vindav!!!