The "crossdomain.xml" file needs to be in the "ROOT" or "public_html" folder on your web site. Other files, including the "IDesign.html" file, can be placed in subfolders on your web site, but the "crossdomain.xml" file must be in the Root directory. The "crossdomain.xml" file allows the "IDesign.html" file to access the clipart & backgrounds.
Note: If you do not know how to find your root directory, please contact your web hosting provider for assistance.