document.getElementById('myHeader').style.filter="glow(strength=" + i + ")"
<html>
<head>
<style>
h1
{
width:400;
}
</style>
<script type="text/javascript">
var i
function glow()
i=0
interval=setInterval("makeglow()",10)
function back()
clearInterval(interval)
document.getElementById('myHeader').style.filter=false
function makeglow()