When the user visits the site, they should see a button (image 1) that isn't a clickable link and a countdown timer (which I can set to various times through the script). When the countdown timer reaches zero, it should change the image of the button to a second image, and enable the user to click that link. Basically I want a countdown timer that unlocks content on the page.
The script doesn't have to be incredibly fancy or complicated, I don't need any sort of backend to set it up - I'm fairly competent with HTML, so it can just be the function itself that I can call from my websites and insert manually into the pages. I'd like this to be done quickly and as simply as possible.
Basic functions I need:
Ability to rotate through two images (one while timer runs, and one after timer ends) for the clickable link
Ability to keep the user from being able to click the link until the timer runs out