I need a script (must be in JavaScript) that changes an image at the same time every day of the week.

Let's say it changes at 8am every day.

I presume it would hold the 7 images in an array and would use something like Date.UTC to ensure everyone was seeing the same image? (Assuming people have their times set right).

Is this something that's hard to do? I have tried to modify existing scripts but can't get anything to work.

Any help appreciated.