conversion de string a entero
<body>
<script>
var pepe = "8";
var juan = parseInt(pepe);
var du = juan / 2;
document.write("du:"+du);
</script>
</body>
<script>
var pepe = "8";
var juan = parseInt(pepe);
var du = juan / 2;
document.write("du:"+du);
</script>
</body>