Flash slideshows are not so hot now for its limitations on mobile devices. Most people are trying HTML5 slideshows. However, if you really want to make flash slideshows, you can use slideshow programs. There are lots of flash slideshow programs which can make flash slideshows for websites. Using slideshow programs to make your flash slideshows will be much easier than writing code to build your slideshow. So I highly suggest you to find a slideshow program to help you out. You can google one very easily. The one I use now is named Photo Slideshow Maker. It's a very awesome program, I think you can have a try. This program is free to download the free to try on its official website and download sites like CNET.