function to output bytes with greatest unit

gistfile1.js

var units = ' KMGTPEZYXWVU';
function toHumanSize(bytes) {
    if (bytes <= 0) { return 0; }
    var t2 = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), 12);
    return (Math.round(bytes * 100 / Math.pow(1024, t2)) / 100) + units.charAt(t2).replace(' ', '') + 'B';
}