var photoset = '72157626355393039';
var url = "http://api.flickr.com/services/rest/?method=flickr.photosets.getPhotos&api_key=ef3a22df315e6eeb35957ad65c74dbcb&photoset_id=" + photoset + "&format=json&jsoncallback=?";
var src;
$.getJSON(url, function(data){
var rand = Math.floor(Math.random()*data.photoset.total);
var photo = data.photoset.photo[rand];
var img = '<a href="http://www.flickr.com/photos/' + data.photoset.owner + '/' + photo.id + '"><img src="http://farm'+ photo.farm +'.static.flickr.com/'+ photo.server +'/'+ photo.id +'_'+ photo.secret +'.jpg" /></a>';
$(img).appendTo("#photo");
});