Mega Code Archive
Use parenthesis in expression
<![CDATA[
< html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
<!--
var inpRadius;
inpRadius = 3;
document.write(Math.PI * ((inpRadius)*(inpRadius)));
// -->
</script>
</head>
<body>
</body>
</html>
]]>