Prova così :

codice:
<script>
document.writeln("<TABLE height=200 width=200 border=0><TR><TD style=\"border: 1px #000000\">");
if(document.all)
	document.writeln("<MARQUEE onmouseover=this.stop() onmouseout=this.start() scrollAmount=1 hspace=2 vspace=2 scrollDelay=1 direction=up width=\"100%\" height=\"100%\">");
else
	document.writeln("<div style=\"width:100%; height:200px; overflow:auto;\">");
document.writeln("










");
</script>
<center>
Tuo file .txt 

</center>
<script>
document.writeln("










");
if(document.all)
	document.writeln("</MARQUEE>");
else
	document.writeln("</div>");
document.writeln("</TD></TR></TABLE>");
</script>