Looking at your embedding code, it appears that your 'myfreebies' folder should be a complete Juicebox gallery folder but there is no 'jbcore' folder inside it.
If you have a complete gallery folder named 'myfreebies' on your computer's hard drive at the moment, then just upload the complete folder (not just the contents) to your website's root directory (alongside your 'mygallery' folder from this forum thread) and the gallery should show up on your 'Freebies.htm' page.
Incidentally, you can use an absolute path for your baseUrl but if you hardcode a 'www' subdirectory in the path, your gallery might not display if the URL in the browser's address bar does not contain the 'www' subdirectory.
Please see this FAQ:
My gallery works on 'www.example.com' but not on 'example.com' (or vice versa). Why?
It would be safer to use relative paths (and your gallery will display on both 'chrissyclark.com' and 'www.chrissyclark.com'.
Once you've uploaded your complete 'myfreebies' folder to your website's root directory, use the following <script> section.
<script src="/myfreebies/jbcore/juicebox.js"></script>
<script>
new juicebox({
baseUrl: "/myfreebies/",
containerId: "juicebox-container",
galleryWidth: "600",
galleryHeight: "650",
backgroundColor: "FFFFFF"
});
</script>
The leading slashes in the paths above denote your root directory so the code above will work in any web page throughout your site without modification.
One more thing that might be useful to know...
If you plan to embed multiple galleries throughout your site, you can have them all share a single 'jbcore' folder (instead of having one 'jbcore' folder per gallery).
You can upload a single 'jbcore' folder to anywhere on your web server and, for each gallery, just load the 'juicebox.js' file from there. (For example, you could use the 'jbcore' folder from your 'myfreebies' folder for all your galleries.)
This means that you can upgrade all your galleries at once (for example when a new version of Juicebox is released) by replacing just one 'jbcore' folder on your web server.
Documentation for having galleries share a 'jbcore' folder can be found here.
(Having galleries share a 'jbcore' folder does not affect the baseUrl paths that your galleries use.)