Javascript, Knut's Shuffle

//initialize array
var arr = new Array();
var i;
for (i=0;i<52;++i)
arr[i]=i+1;

//Knuth's shuffle
for (i=arr.length-1;i>0;--i)
{
ran_index = Math.floor((Math.random() * 10) % (i+1));

var temp = arr[i];
arr[i] = arr[ran_index];
arr[ran_index] = temp
}


//print the cards out
for (i=0;i<52;++i)
{
if (i%10 == 0)
document.write("
");
document.write(arr[i]);
document.write(",");
}