Neon text effect using Javascript

<style>
body {
 
	background-color: black;
}
</style>
<h2>
<script language="JavaScript1.2">
 
var message="Welcome to Sourcecodester!"
var neonbasecolor="white"
var neontextcolor="yellow"
var flashspeed=100  //in milliseconds
 
///No need to edit below this line/////
 
var n=0
if (document.all||document.getElementById){
document.write('')
for (m=0;m<message.length;m++)
document.write('<span id="neonlight'+m+'">'+message.charAt(m)+'</span>')
document.write('')
}
else
document.write(message)
 
function crossref(number){
var crossobj=document.all? eval("document.all.neonlight"+number) : document.getElementById("neonlight"+number)
return crossobj
}
 
function neon(){
 
//Change all letters to base color
if (n==0){
for (m=0;m<message.length;m++)
//eval("document.all.neonlight"+m).style.color=neonbasecolor
crossref(m).style.color=neonbasecolor
}
 
//cycle through and change individual letters to neon color
crossref(n).style.color=neontextcolor
 
if (n<message.length-1)
n++
else{
n=0
clearInterval(flashing)
setTimeout("beginneon()",1500)
return
}
}
 
function beginneon(){
if (document.all||document.getElementById)
flashing=setInterval("neon()",flashspeed)
}
beginneon()
 
 
</script>
</h2>