标题滚动显示

<tltle>

</title>

var titleMes = document.title ;
titleMes = "..." + titleMes ;
mesLong = 0;
function  titlescroll(){
document.title = titleMes.substring(mesLong , titleMes .length )+titleMes.substring(0,mesLong );
mesLong ++;
if (mesLong>  titleMes .length) {mesLong= 0}
window.setTimeout("titlescroll()",400);

};
titlescroll();