Html code for email validiation

<html>
<head>
<script>
function validate(form_id,email) {

   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.forms[form_id].elements[email].value;//alert(reg.test(address));
   if(reg.test(address) == false) {

      alert('Invalid Email Address');
      return false;
   }
}

</script>
</head>
<body>
<form id="form_id" method="post" action="action.php" onSubmit="javascript:return validate('form_id','email');">

   <input type="text" id="email" name="email" />

   <input type="submit" value="Submit" />
</form>


</body>
</html>

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