Randomly sort an array

randomsort.js

function randomsort(arr) {
    var i = arr.length, j, tempi, tempj;
    if ( i == 0 ) return this;
    while ( --i ) {
        j       = Math.floor( Math.random() * ( i + 1 ) );
        tempi   = arr[i];
        tempj   = arr[j];
        arr[i] = tempj;
        arr[j] = tempi;
    }
    return arr;
}

The former version doesn't shuffle much of the array.