ok ho risolto cosi:

function prepare(response) {
var d = new Date();
count++;
d.setTime(response.time*1000);
var mytime = d.getHours()+':'+d.getMinutes()+':'+d.getSeconds() ;
$('#daddy-shoutbox-list').empty();
var string = '<div class="shoutbox-list" id="list-'+count+'">'
+ '<span class="shoutbox-list-time">'+mytime+'</span>'
+ '<span class="shoutbox-list-nick">'+response.nickname+':</span>'
+ '<span class="shoutbox-list-message">'+response.message+'</span>'
+'</div>';
return string;
}


che ne dici?