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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
	<title>Required Field</title>
<SCRIPT>

function checkRequired() {
var num=document.card.cardnum.value;
var len=num.length;
alert("your enter the value:"+num);
if (len ==0) {
	alert("this field is required");
	event.returnValue=false;
}


}
</SCRIPT>
</head>

<body>
<form action="http://localhost/dummy.jsp" name="card" id="card" onSubmit="checkRequired();">
Enter your name:<br>
<input type="text" name="cardnum" size=10><br>
<input type="submit">
</form>


</body>
</html>