Membuat Efek Lampu Berjalan Di Text

<b><script language="JavaScript1.2">
var message="TULISAN DI DALAM TANDA PETIK INI ADALAH TULISAN YANG BEREFEK LAMPU BERJALAN"
var neonbasecolor="gray"
var neontextcolor="orange"
var neontextcolor2="#3300ff"
var flashspeed=1
var flashingletters=10    // jumlah huruf yang tersorot oleh flash
var flashingletters2=3    // jumlah warna di ekor flash
var flashpause=1                 
///
var n=0
if (document.all||document.getElementById){
document.write('<font color="'+neonbasecolor+'">')
for (m=0;m<message.length;m++)
document.write('<span id="neonlight'+m+'">'+message.charAt(m)+'</span>')
document.write('</font>')
}
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++)
crossref(m).style.color=neonbasecolor
}
//cycle through and change individual letters to neon color
crossref(n).style.color=neontextcolor
if (n>flashingletters-1) crossref(n-flashingletters).style.color=neontextcolor2
if (n>(flashingletters+flashingletters2)-1) crossref(n-flashingletters-flashingletters2).style.color=neonbasecolor
if (n<message.length-1)
n++
else{
n=0
clearInterval(flashing)
setTimeout("beginneon()",flashpause)
return
}
}
function beginneon(){
if (document.all||document.getElementById)
flashing=setInterval("neon()",flashspeed)
}
beginneon()
</script> </b>