<Script language="javascript">
<!--
var m="请您认真学习JAVASCRIPT这门语言！"
var a=""
i=0
s=0
function scrollit() {
i++
if(i>m.length) {
i=1
}
a=m.substring(0,i)
b=m.substring(0,i-1)
document.forms[0].elements[0].value=a
document.forms[0].elements[1].value=b
setTimeout("scrollit()",100)
}
//-->
</script>
<body onload=scrollit()>
<form name="msg">
<input type="text" size=50 name="mesg1"><br>
<input type="text" size=50 name="mesg2">
</form>
</body>