<html>
<head>
<title>Programming forum
</title>
</head>
<script language="javascript">
document.write("ENTER YOUR COMMENT");
function valuetest()
{
if(test.comment.value=="")
{
alert("No comments entered");
}
}
</SCRIPT>
<form Name="test">
<input type="text" name="comment" value="">
<P><input type="Submit" onClick="valuetest()"></P>
</form>
</body>
</html>
This code need to be linked with CGI script.