Image Cross Fade
Image Cross Fade Time Delay
One image is placed on top of the other and then the opacity is changed over a period of time.
Make sure that both images are exactly the same size and allow a long enough animation time for the page to load before the effect takes place.
Image Cross Fade on Mouseover
Cross fade from one image to another on hover.
Both images can have alt text for SEO and the transition time can be varied the same as the one above.
The mouseover image can be a hyperlink to another page or file if required.