JavaScript檢查Email的格式

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<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
<title>EMAIL检验</title>
</head>
<body>
<SCRIPT LANGUAGE='JavaScript'>
<!--
function check()
{
 if(document.register.email.value.length!=0)
  {
    if (document.register.email.value.charAt(0)=='.' ||       
         document.register.email.value.charAt(0)=='@'||      
         document.register.email.value.indexOf('@', 0) == -1 ||
         document.register.email.value.indexOf('.', 0) == -1 ||
         document.register.email.value.lastIndexOf('@')==document.register.email.value.length-1 ||
         document.register.email.value.lastIndexOf('.')==document.register.email.value.length-1)
     {
      alert('Email的格式不正确!');
      document.register.email.focus();
      return false;
      }
   }
 else
  {
   alert('Email的不能为空!');
   document.register.email.focus();
   return false;
   }
 return false;
}
//-->
</SCRIPT>
<form name='register' method='POST' action onSubmit='return  check();'>
<p align='center'>
  Email:<input type='text' name='email' size='20'>
  <input type='submit' value='提交' name='B1'>
  <input type='reset' value='重填' name='B2'>
</p>
</form>
</body>
</html>