Display contents of JavaScript object

function dir(o, d){
	var s = '';
	var t = d || '';
    console.log('|' + t + '|');
	for(var p in o){
		if(typeof o[p] == 'object'){
			l = (Object.prototype.toString.call(o[p]) === '[object Array]') ? '[array]' : '[object]';
			s += t + p + ': ' + l + '\n';
			s += dir(o[p], t + '     ')
		}else{
			s += t + p + ': ' + o[p] + '\n';	
		}
	}
	if(!d){
		alert(s);
	}
	return s;
}