See the Example of a simple Program in both HTML and JavaScript
Program in html:-

<HTML>
<HEAD>
<title>HTML to JavaScript</title>
</head>
<BODY>
HTML to JavaScript Converter
</BODY>
</HTML>

Program in JavaScript:-

<script language="JavaScript">
<!--
document.writeln("<HTML>");
document.writeln("<HEAD>");
document.writeln("<title>HTML to JavaScript</title>");
document.writeln("</head>");
document.writeln("<BODY>");
document.writeln("HTML to JavaScript Converter");
document.writeln("</BODY>");
document.writeln("</HTML>");
//-->
</script>

Hope this will help you.......