Just write a closure to perform the decrement like so:
if (secs < 1) {
element.innerHTML = 'Countdown Complete!
';
element.innerHTML += 'Click here now';
} else {
// wait 1 second
setTimeout(function() {
countDown(secs - 1); // decrement and run ourselves again
}, 1000);
}
I've also removed the clearTimeout() in favour of a simple else condition.