JavaScript implementation of Fisher-Yates shuffle (http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle).

gistfile1.js

function shuffle(a){
        var j, temp;
    
    for(i = a.length-1; i > 1; i--){
        j = Math.floor(Math.random() * (i + 1));
        
        temp = a[i];
        a[i]  = a[j];
        a[j]  = temp;
    }
    
    return a;  // Return to enable chaining.
}