As your complete gallery folder has been uploaded to http://galerie.parlamer.fr/yorktown/ your embedding code should look like this (there should be no 'galerie' in the paths):

<!--START JUICEBOX EMBED-->
<script type="text/javascript" src="/yorktown/jbcore/juicebox.js"></script>
<script type="text/javascript">
    new juicebox({
        containerId : "juicebox-container",
        galleryWidth: "100%",
        galleryHeight: "100%",
        backgroundColor: "rgba(34,34,34,1)",
        baseUrl: '/yorktown/'
    });
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

I have just noticed you have no commas separating the backgroundColor from the baseUrl in your gallery's embedding code.
(I copied and pasted your code and changed only the paths.)
I have now corrected the code in my post above.

If it still does not work, please post the URL to the web page into which you are trying to embed your gallery so that I can take a look and help further.

In fact, I added comas in my first version and it's working :
<!--START JUICEBOX EMBED-->
<script src="/galerie/yorktown/jbcore/juicebox.js"></script>
<script>
  new juicebox({
    baseUrl : '/galerie/yorktown/',
    containerId : 'juicebox-container',
    galleryWidth : '800',
    galleryHeight : '600',
    backgroundColor: '#222222'
  });
  </script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

Now I have a new question,
How can I call the album from another domain.
I have parlamer.net and parlamer.fr

I want to let the gallery on parlamer.fr/galerie
But I want to embed in a page on parlamer.net

I tried :
<!--START JUICEBOX EMBED-->
<script src="http://galerie.parlamer.fr/yorktown/jbcore/juicebox.js"></script>
<script>
  new juicebox({
    baseUrl : 'http://galerie.parlamer.fr/galerie/yorktown/',
    containerId : 'juicebox-container',
    galleryWidth : '800',
    galleryHeight : '600',
    backgroundColor: '#222222'
  });
  </script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

But I have a message : Juicebox Error: Config XML file not found.
What's wrong ?

Thank you