<span id="totalSecond">5</span>

<script language="javascript" type="text/javascript"> 
var second = document.getElementById('totalSecond').textContent; 

if (navigator.appName.indexOf("Explorer") > -1)  { 
	second = document.getElementById('totalSecond').innerText; 
} else { 
	second = document.getElementById('totalSecond').textContent; 
} 

setInterval("redirect()", 1000); 
function redirect() { 
if (second < 0) { 
	location.href = 'hello.html'; 
} else { 
	if (navigator.appName.indexOf("Explorer") > -1) { 
		document.getElementById('totalSecond').innerText = second--; 
	} else { 
		document.getElementById('totalSecond').textContent = second--; 
	} 
} 
} 
</script>