Safe, simple and cross browser (I hope) version of console.log

nano.console.js

(function(root){
    if ( ! root['nano']) { root.nano = {}; }

    /**
     * Safe, simple and cross browser (I hope) version of console.log.
     */
    nano.console = (function(root) {
        var csl = root.console || { log: function() {} },
            fn = function() {
                var me = this,
                    l = ['log', 'warn', 'info', 'debug', 'error'],
                    i = 0, len = l.length, v;

                for (; i < len, v = l[i]; i++) {
                    if ( ! fn.prototype[v])                         
                        me[v] = function(v) {
                            return function() { 
                                Array.prototype.unshift.call(arguments, v+': ');
                                me.log.apply(csl, arguments); 
                            }
                        }(v);
                }
            };

        fn.prototype = csl;
        fn.prototype.constructor = fn;

        return new fn;
    })(root);
})(this);