var msg="一套教材學會一個方法，讓你終身受益，不再害怕背單字~^o^~";
var interval = 120;
seq = 0;
function Scroll() {
	len = msg.length;
	window.status = msg.substring(0, seq+1);
	seq++;
	if ( seq >= len ) { seq = 0 };
	window.setTimeout("Scroll();", interval );
}
Scroll();