If you would like to manually embed a Juicebox gallery in a Drupal page, I would recommend using the baseUrl method of embedding as documented here.
Essentially, you would create a gallery with JuiceboxBuilder-Pro, upload the entire gallery folder (not just the contents) to your web server and paste the baseUrl embedding code into your web page.
It does not matter where you upload the gallery folder to on your web server as long as the paths within the embedding code (the path to the 'juicebox.js' file and the baseUrl itself) are correct.
You do not need to upload your gallery folder to a location within your Drupal installation and you do not need to use the Juicebox files from their location within the Drupal module (although you can if you like).
For example, if you have a gallery folder named 'my_gallery_folder' and you upload the entire folder to the root directory of your web server (into your 'public_html') folder, then the embedding cdoe you would use would look something like this:
<!--START JUICEBOX EMBED-->
<script src="/my_gallery_folder/jbcore/juicebox.js"></script>
<script>
new juicebox({
baseUrl : '/my_gallery_folder/',
containerId : 'juicebox-container',
galleryWidth : '800',
galleryHeight : '600',
backgroundColor: '#222222'
});
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->
To directly answer your query above, there are a few problems with the code you use.
(1) If using an absolute URL, it should start with 'http://'.
(2) The 'public_html' folder name does not form part of the publicly accessible path.
(3) Your baseUrl line of code should have a comma (',') after it as there are further configuration options after it.
Therefore:
<script src="www.joaqimb.be/public_html/sites/all/libraries/juicebox/juicebox.js"></script>
... would become:
<script src="http://www.joaqimb.be/sites/all/libraries/juicebox/juicebox.js"></script>
... and:
baseUrl : "www.joaqimb.be/public_html/sites/all/libraries/juicebox/classic/img/Juicebox Namur"
... would become:
baseUrl : "http://www.joaqimb.be/sites/all/libraries/juicebox/classic/img/Juicebox Namur/",
Rather than using absolute paths, I would recommend using the leading slash notation (to denote your root directory) rather than hard-coding the 'www' subdomain into your patsh so that your galleries display on both www.joaqimb.be and joaqimb.be.
Try using the the following lines of code in your embedding code:
<script src="/sites/all/libraries/juicebox/juicebox.js"></script>
baseUrl : "/sites/all/libraries/juicebox/classic/img/Juicebox Namur/",
