"Pete's Pizza" v1.6

<!DOCTYPE HTML>
<meta charset="UTF-8">
<html>
<head>
<script type="text/javascript" defer>
function delivery(){
    var custName1 = prompt('What name will the order be under?');
        if ((isNaN(custName1)))
        {
        }
        else
        {
            alert('Please enter a valid (non numeric) name.');
            delivery();
        }
    var custAddress1 = prompt ('What address should we deliver the order to?');
    var custNumber1 = prompt ('Please enter your phone number (land-line) in case we need to contact you');
        while ((isNaN(custNumber1)) || (custNumber1 < 8600000) || (custNumber1 > 9999999))
            {
                var custNumber1 = prompt('Please enter a valid 7 digit number.\nfrom 8600000-9999999');
            }
    var custDet1 = confirm('Customer Details\nName: '+custName1+'\nAddress: '+custAddress1+'\nPhone Number: '+custNumber1+'\n\nAre these details correct? Press Ok to proceed, or Cancel to restart.\n');
        if (custDet1 == false)
                {
                delivery();
                }
        else
                {
                }

}
function pickup(){
    var custName2 = prompt('What name will the order be under?');
    var custDet2 = confirm('Customer Details\nName: '+custName2+'\n\nAre these details correct? Press Ok to proceed, or Cancel to restart.');
    if (custDet2 == false)
        {
            pickup();
        }
    else
        {
        }
    var ammount2 = prompt('How many pizzas would you like to order?');
}

</script>
<title>Pete's Pizza</title>
</head>
<body bgcolor="#66FFCC">
<div id="main"><center><h1>Pete's Pizza</h1>
<h2><i>"The best pizza in Gisborne!"</i></h2><br>
<h2><b><font color="red">◄</font> Pete's Pizza Menu <font color="red">►</font></b></h2>
<br>
<h3>Standard Pizzas (Hawaiian, Cheese, Veggie, Supreme, Pepperoni) - cost: <font color="red"><b><u>$9:50</u></b></font></h3>
<h3>Gourmet Pizzas (Meat-lovers, Chicken, Prawn) - Cost: <font color="red"><b><u>$15.50</u></b></font></h3>
<br><br>
<hr width="1200px" color="#003300">
<br>
<h2><b><font color="#003300">◄ </font>Is this order for 'Pickup' or 'Delivery'?<font color="#003300"> ►</font></b></h2><br>
<input type=button value="Delivery" onclick="delivery()" id="delivery">&nbsp;<input type=button value="Pickup" onclick="pickup()" id="pickup">
</center>
</div>
</body>
</html>