UFO is a DOM script that detects the Flash plug-in and embeds Flash objects. It has the following features:

• UFO automatically performs major version and build version (sometimes called minor version) tests, based on the Flash movie’s publish settings. This means that you can reuse UFO to embed multiple Flash movies that are published for different plug-in versions. All tests should be future-proof.
• UFO is easy to use. It only takes 4 simple steps to build a Web page that contains an unobtrusive Flash movie. UFO also uses a user-friendly mechanism using property name:value pairs to pass in any amount of parameters in any order you want to.
• UFO is as standards compliant as it can be. Your (X)HTML pages will pass the W3C validation tests, because UFO generates the Flash object’s (X)HTML code with JavaScript. However all non IE/Win browsers do receive a piece of (X)HTML code containing the proprietary embed element.
• UFO scores high on accessibility.
• UFO is unobtrusive. This means that all (X)HTML, CSS and JavaScript code is fully separated from each other. UFO uses cross-browser load events and you can just add UFO to your existing pages without overwriting existing onload events.
• UFO follows the principles of progressive enhancement. You build your Web page as if a user doesn’t have the required Flash plug-in support, using semantic and search-engine-friendly content. UFO will automatically replace this content when there is sufficient JavaScript and Flash plug-in support.
• UFO is fully recycable. You can reuse UFO to publish different Flash movies, targeted at different Flash player versions and with a different set of attributes and parameters.
• UFO supports Macromedia’s express install feature.
• UFO supports MIME type application/xhtml+xml.