Anfänger braucht Hilfe

[Privateer]

Hallo Zusammen,

ich als blutiger Anfänger, sitze schon seit Stunden vor folgender Aufgabe:

The program should take the user through the following process:
1. the customer is prompted to enter how many different products they want to purchase (you can assume the customer will input a whole number)
2. For each product, the customer is then prompted to
•enter the item number from the column headed Item in Figure 2, (e.g. they would enter 3 to choose product n-87-012)
•enter how many units of that product they require
(e.g. 6 Headbanger hi-fis).
3. Step 2 is then repeated until the number of products the user chose in Step 1 is reached. When the ordering process is complete, the program prints out the order.

Bisher habe ich folgendes erstellt, aber irgendwie bekomme ich den Output nicht hin.

var customerCodes = ['lt-17', 'gw-3', 'lg-9', 'il-77', 'fy-32'];

var customerPasswords = ['password', 'bluesky', 'dr45gr6', 'onlyme', 'lothlorien'];

// These are arrays containing product data

var productCodes = ['a-23-009', 'k-246-07', 'd-555-01', 'n-87-012', 'u-521-08', 't-99-002'];

var productDescriptions = ['Superslurry electric blender', 'Apple - iPod (second-hand)',  'CoziNap nylon duvet tog 2', 'Headbanger mini hi-fi 20W', 'MagiBoot shoe cleaning kit', 'The PushmiPulu lawnmower'];

var productPrices = [45, 50, 15, 25, 75, 7, 60];

var productStock = [200, 0, 2, 500, 500, 15];

// These are useful variables

var customerIndex;
var password = "";
var found = false;
password = window.prompt("Please enter your password");
checkPassword();
 // iterate over password array
function checkPassword()
{
for(var i = 0; i < customerPasswords.length && found == false; i++)
{

// check if password match
  if(password == customerPasswords[i])
  {
   // remember customerIndex
   customerIndex = i;
   found = true;
  }
}
if (found == true)
{
window.alert("Welcome, Customer " + customerCodes[customerIndex] + ". Ready to start shopping?");
}
else
{
window.alert("Wrong password");
password = window.prompt("Please enter your password");
checkPassword();
}
}

document.write("<BR>" + "<BR>" + "Here are the exciting products we have available today:");
document.write("<BR>" + "Item---Code--------Product-------------------Price- --Stock");
document.write("<BR>" + "=============================================" + "<BR>");
for (var j = 0; j < productCodes.length; j++)
{
document.write(j + "---" + productCodes[j] + "--" + productDescriptions[j] + "---" + productPrices[j] + "--  " + "--" + productStock[j] + "<BR>");
}

var numberOfProducts;
numberOfProducts = window.prompt("How many different products you want to purchase?");
var orderProductArray = new Array (numberOfProducts);
var orderQuantityArray = new Array(numberOfProducts);
var findProduct = new Array(numberOfProducts);

for (var k = 1; k <= numberOfProducts; k++)
{
orderProductArray[k] = window.prompt("Please enter the item number for product " + k + " you want to purchase");
orderQuantityArray[k] = window.prompt("How many units do you require for product " + k + " ?");

for (var r = 0; r < productCodes.length; r++)
 {
    if (productCodes[r] == orderProductArray[k])
    {
        findProduct[r] = r
    }
 }
}
document.write("<BR>" + "Here is your order il-77");
document.write("<BR>" + "Code--------Product------------------------Number----------Price Each");
document.write("<BR>" + "========================================");
for (var l = 1; l <= numberOfProducts.length; l++)
{
document.write("<BR>" + productCodes[findProduct] + "--" + productDescriptions[findProduct] + "-----" + orderQuantityArray[k] + "------------" + + productPrices[findProduct] + "<BR>");
}

Kann mir vielleicht jemand helfen und Licht ins Dunkel bringen?