Now lets see how to install it in your blog as it is very simple.
Go to Page Elements and click on Add a Gadget on the sidebar. Select HTML/Javascript and add the javascript code given below and save the widget/gadget.
<div id="myLuckyPost"></div> <script type="text/javascript"> 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 = 'Are ya feeling lucky, punk?'; document.getElementById('myLuckyPost').appendChild(a); } </script> <script src="/feeds/posts/summary?max-results=0&alt=json-in-script&callback=feelingLucky"></script><noscript><a href="http://anshuldudeja.blogspot.com" target="_blank">Blogger Hacks</a></noscript>
I hope you will install it very easily Good Luck!!