I need to have a new product image everyday on a webpage automatically. Product of the day kinda thing.
Just one single image that changes every day with a new one.

The images do not have to be part of a slideshow, nor have to have a player installed, nor have text. 

I have a folder with all the images. I have a page on a website where that image should go.

How can I do that?

I'm not a programer nor write code, so I need to find something specific that tells me step by step, hopefully how I may accomplish this. I have found several "rotating" scrips but they deal with things like caroussel, or fairly vague as to how go about it etc. 

All I need to know is how to create an automatic function that will go to that image folder and insert a picture on that webpage everyday. Oh yeah, the images are not all the same size. 
The web site is hosted by Weebly. (they don't know how to do this btw.) 

Is there anyway to do this? 

Thank you much in advance for your help!!