Печатающийся текст в Titlе браузера

<script type="text/javascript">
var title_mess = document.title;
var pos = 0;
 
function write_title() {
document.title = title_mess.substring(0,pos);
if(pos==title_mess.length) {
 pos = 0;
 setTimeout("write_title()", 3000)
}
else {
 pos++;
 setTimeout("write_title()", 200)
}
}
write_title()
</script>