gistfile1.js

function createNamedFunction() {
  var _cnf = Array.prototype.slice.call(arguments, 0);
  _cnf.name = _cnf.shift();
  _cnf.code = _cnf.pop();
  return new Function('return function NAME(ARGS) {CODE}'.
    replace('NAME', _cnf.name).
    replace('ARGS', _cnf.join(',')).
    replace('CODE', _cnf.code))();
}

// Test it
var sys = require('sys');
var f = createNamedFunction('fred', 'x', 'y', 'return x*y');
sys.log('function defined globally? ' + (typeof(fred) != 'undefined'));
sys.log(f.toString());
sys.log(f(10,11));