fix

.js

<script type="text/javascript">
var c=0;
var t;
var timer_is_on=0;

function timedCount()
{
if (c<50)
{
document.getElementById('txt').value="###############";
}
else if (c==50)
{
document.getElementById('txt').value="DAT";
}
else if (c>50)
{
document.getElementById('txt').value="###############";
window.clearTimeout(t);
}
c=c+1;
t=setTimeout("timedCount()",25);
}

function doTimer()
{
if (!timer_is_on)
  {
  timer_is_on=1;
  timedCount();
  }
}
</script>