crystaltrumpet,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<div id="blockwait">blockwait</div>
<div id="blocktimer" style="display: none">blocktimer</div>
<form name="frm" action="http://">
<input name="clock">
</form>
<script>
var mya = true, tm, vtime = 0;
function startClock() {
clearTimeout(tm);
document.forms['frm'].clock.value = vtime;
if (vtime < 5) {
!document.hidden && vtime++;
tm = setTimeout(startClock, 1000);
}
else {
document.getElementById('blockwait').style.display = 'none';
document.getElementById('blocktimer').style.display = '';
}
}
startClock()
</script>
</body>
</html>