Actually, you'll need one of the following:
1- A client side script if JavaScript is enabled
2- If JavaScript isn't enabled, a gif or png with multiple images embedded
3- If JavaScript isn't enabled, an iFrame which refreshes at some pre-determined interval
4- Any of the above in combination
5- All except number#2, involves some type of server-side processing in addition.
If this spec: "I want the next image to load each time rather then to have the images load at random. My goal is to have people see different images each time they come to our web site.", is as restrictive as it seems to be, you'll need to explore a more involved solution.
It sounds like you want:
Any user to experience a different image when they visit your site?
All users to experience a different image when they visit your site?
???