電光掲示板風動く文字1

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<form name="fm">
<input type="text" size="40" name="txt" style="border 0px none #ffffff;">
</form>
<script type="text/javascript">
<!--
var str   = "文字が電光掲示板風に流れていきます。";
var time  = 200;
var tmp   = "";

function denKou(){
  clearTimeout(tmp);
  str = str.substring(1,str.length) + str.substring(0,1);
  document.fm.txt.value = str;
  tmp = setTimeOut("denKou()",time);
}
denKou();
//-->
</script>
</body>
</html>