Should we have any flashing text or images?

No, because rapidly flashing (or scrolling) text or images usually look awful, are considered by Web designers to be quite outdated and amateurish, and are annoying to most Internet users, especially if they cannot turn off the effects. The only tasteful movement on a Web page is an optional slideshow, which rotates through non-advertising images at a slow pace, or an embedded video that does not start automatically but instead is controlled by the website visitor.