Kleiner Fehler bei Titelscrollfunktion im TAB

<script language=javascript><!--
var rev = "fwd";
function titlebar(val)
{
var msg = "TheFstX";
var res = " ";
var speed = 120;
var pos = val;

msg = " |--- "+msg+" ---|";
var le = msg.length;
if(rev == "fwd"){
if(pos < le){
pos = pos+1;
scroll = msg.substr(0,pos);
document.title = scroll;
timer = window.setTimeout("titlebar("+pos+")",speed);}
else{
rev = "bwd";
timer = window.setTimeout("titlebar("+pos+")",speed);}}
else{
if(pos > 0){
pos = pos-1;
var ale = le-pos;
scrol = msg.substr(ale,le);
document.title = scrol;
timer = window.setTimeout("titlebar("+pos+")",speed);}
else{
rev = "fwd";
timer = window.setTimeout("titlebar("+pos+")",speed);}}}
titlebar(0);
--></script>