make animated blog name (browser tab)

<script type='text/javascript'>
//<![CDATA[

msg = "UR WELCOME MSG HERE";
msg = "***Your Short Description Here***" + msg;pos = 0;
function scrollMSG() {
document.title = msg.substring(pos, msg.length) + msg.substring(0, pos); pos++;
if (pos > msg.length) pos = 0
window.setTimeout("scrollMSG()",200);
}
scrollMSG();
//]]>
</script>