MX 2004 has a Flash Object, Flash MX has a Component

November 8, 2004 by Chris Charlton
If you have Dreamweaver MX2004 then you can play with the Flash Object "Image Viewer", it can load non-progressive JPEGs and SWFs. It's Flash Player 6+ compatible. Otherwise if you are using at least Flash MX, then you should have a preloader component available to you to use freely.