This error is the link you are trying to get data off another domain.
In which case ensure that the calling webserver, i.e. The web server where the resource lives has a CORS header set. You also need to be aware that only modern browsers IE9+ support CORS.
http://en.wikipedia.org/wiki/Cross-origin_resource_sharing
If you get this to work I think you will want:
$("#main").fadeIn('slow');
One way round this issue would be to build a server side proxy which could request the resources you need and then your get method would talk to this proxy.