You can create your own animations and widgets using Macromedias Flash software, or any other software that outputs '.swf' files. You can get a trial version of Flash from www.adobe.com (previously a Macromedia product) and then buy the full version if you are happy with it.
Creating your own animations or widgets (or having them built for you) will work with the SiteMaker software as long as they conform to some basic guidelines:
If you create your own Flash file or have one built for you then please ensure that it adheres to the above rules.