function showLucky(root){
var feed = root.feed;
var entries = feed.entry || [];
var entry = feed.entry[0];
for (var j = 0; j < entry.link.length; ++j){
if (entry.link[j].rel == 'alternate'){
window.location = entry.link[j].href;
}
}
}

function fetchLuck(luck){
script = document.createElement('script');
script.src = '/feeds/posts/summary?start-index='+luck+'&max-results=1&alt=json-in-script&callback=showLucky';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);
}

function feelingLucky(root){
var feed = root.feed;
var total = parseInt(feed.openSearch$totalResults.$t,10);
var luckyNumber = Math.floor(Math.random()*total);
luckyNumber++;
a = document.createElement('a');
a.href = '#random';
a.rel = luckyNumber;
a.onclick = function(){
fetchLuck(this.rel);
};
a.innerHTML = '<img src="http://h.imagehost.org/0843/3_26.png" title="Postagem Aleat&oacute;ria"/>';
document.getElementById('myLuckyPost').appendChild(a);
}