I want to make a web page that has image swapping capabilities like when you load the web page, a static image is shown, but each time you reload the page or load it at different times, the image changes. How do I do this? An example page that I was looking at was the UNLV (http://www.unlv.edu) web site in which the picture on the left changes each time I refresh the page. How do I do this to my page? Any site explain this or anything?