tuchkovo-auto,
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Бегущая строка.</title>
<script>
var title = document.title,
orgn_ttl;
function titleMarquee(a) {
a ? (clearTimeout(orgn_ttl), document.title = title) : (document.title = document.title.substring(1) + document.title.substring(0, 1), orgn_ttl = setTimeout(titleMarquee, 600))
}
titleMarquee();
</script>
</head>
<body>
<button title="Stop The Title" onclick="titleMarquee(true)">Stop Title</button>
</body>
</html>