一个很简单的网页设计，大家帮忙看看

<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999.xhtml">
<head>
<title>check system time</title>
<style type="text/css">
body {background-color: navy}
</style>
<script type="text/javascript">
<!--HIDE FROM INCOMPATIBLE BROWSER
var hour
today=new Date()
hour=today.getHours();
//STOP HIDING FROM INCOMPATIBLE BROWSER -->
</script>
</head>
<body>
<script type="text/javascript">
<!--HIDE FROM INCOMPATIBLE BROWSER
var a;
var b;
if (hour>=00 && hour<12)
  a=1;
  while(a<=10){
      document.write("<p style='font-size:16pt;color:white'>"+a+"</p>");
       a++;
  }
if(hour>=12 && hour<24)
   for(b=20;b<=30;b++){
   document.write("<strong style='font-size:14pt;color:yellow'>"+b+" "+"</strong>");}
//STOP HIDING FROM INCOMPATIBLE BROWSER -->
</script>
</body>
</html>