Navigate to Url

I have an intro animation and at the end I navigate to my main site with

navigateToURL(new URLRequest(‘main.html’),"_self");

this was fine until I added a preloader. When the preloading is done this loads my intro with:

var myRequest:URLRequest = new URLRequest(“intro.swf”);
var myLoader:Loader = new Loader();
myLoader.load(myRequest);

now the navigate does not work. I have tried

parent.navigateToURL(new URLRequest(‘main.html’),"_self");

does anyone know how I can get this to work?