Update NimbleKit's NKLog with proper variable interrogation

gistfile1.js

//
// https://gist.github.com/1208947
// Include this JS right after NKit.js in your HTML files.
// Now NKLog() will show you the contents of arrays and objects!
//

var NKLog1 = NKLog;
var NKLog = function (arg) {
    NKLog1('\n' + NKInterogate(arg));
}

function NKInterogate(arg) {
    var output;
    
    if (typeof arg === 'object' && arg.length) {
        output = '[\n';
        
        for (var i = 0; i < arg.length; i++) {
            output += '\t' + NKInterogate(arg[i]).toString().split('\n').join('\n\t') + ',\n';
        }
        
        output += ']';
        
    } else if (typeof arg === 'object') {
        output = '{\n';
        
        for (k in arg) {
            output += '\t' + k + ': ' + NKInterogate(arg[k]).toString().split('\n').join('\n\t') + ',\n';
        }
        
        output += '}';
        
    } else if (typeof arg === 'string') {
        output = '"' + arg + '"';
        
    } else {
        output = arg;
    }
    
    return output;
}

JSON.stringify() unfortunately doesn't quite give the output the way I want it, and also doesn't report functions correctly.

NimbleKit's NKLog() does not function like console.log() in Firebug or Webkit Inspector... it would just output [Object object] which wasn't very useful.