move formatBytes to util.js

util.js

@@ -1,3 +1,14 @@
+// https://stackoverflow.com/a/18650828
+function formatBytes(bytes, decimal) {
+    if (0 == bytes)
+        return "0 bytes";
+    var c = 1024;
+    var d = decimal || 2;
+    var e = ["bytes", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
+    var f = Math.floor(Math.log(bytes) / Math.log(c));
+    return "<b>" + parseFloat((bytes / Math.pow(c, f)).toFixed(d)) + "</b> " + e[f]
+}
+
 function print_money(amount, decimal_point) {
     var s1 = String(amount);
     while (s1.length < decimal_point+1)