Loading modules on the fly?

I'm just updating those docs for modules. The following works:

function loadModule(moduleName, callback) {
  require("http").get("http://www.espruino.com/modules/"+moduleName+".js", function(res) {
    var contents = "";
    res.on('data', function(data) { contents += data; });
    res.on('close', function() { 
      Modules.addCached(moduleName, contents); 
      if (callback) callback();
    });
  }).on('error', function(e) {
    console.log("ERROR", e);
  });
}

(but it's not synchronous)