Page keeps loading, no toolbar

I downloaded and unzipped FCKeditor to the root of the server. Before I made any change to a file I first wanted to try the editor. So I opened a sample-file. I see the textfield and button, but I don't get any toolbar. In the leftcorner of my browser the text "Waiting for localhost..." is being displayed and that's it. I waited 10 minutes, but still no toolbar.
The demo on FCKeditor.net works fine so it seems I'm doing something wrong.
Can anyone help?