The basic script needed on almost any webpage/landing is a countdown timer script. Here is the simplest variant of its implementation without any additional libraries: https://gist.github.com/ywbsrp/fb6b9c6f5850694f9e4f89..
It's easy to use: plug in the script, create a few tags for hours-minutes-seconds and that's it)
Let's put it this way:
<div class="»timer»">
<span id="»h»">01</span>:<span id="»m»">00</span>:<span id="»s»">00</span>
</div>
Other scripts for your landings, haiz:
—sending leads to the mail
—back button lock or swap it for another offer
—Comebacker widget
—Callbacker widget
And the script to replace the offerer on the back button - is activated when any click is made on the procle?
That's right!