Belajar Struktur Data with Javascript

?html>
?title>Type Bilangan?/title>
?/head>
?body>
?SCRIPT LANGUAGE = "JavaScript">
?!--
var a = 15;
b = 14;
tambah = a+b;
kali = a*b;
document.write("Penambahan(" +a+ "+" +b+ ") = "+ tambah);
document.write("?BR>");
document.write("Perkalian (" +a+ "x" +b+ ") = "+ kali);
document.write("?BR>");
//-->
?/SCRIPT>
?/body>
?/html>