Yet Another Newbie question

I've been taking Web Design at the local Tech Skool
and have gotten through the first 11 chapters of
/Creating Web Pages with HTML, XHTML and XML/ .
It covers some very elementary Java programming,
mainly doing stupid stuff on webpages.

The final project is creating a _very_ simple
e-commerce website. It's outside the scope of the
class but I'd like to include a rudimentary
shopping cart feature - just some way to keep track
of items added and then list them on the checkout
page. I thought, "Well, I'll just keep the quantity,
description and price in arrays and use the push()
function to put stuff in, then interate through the
arrays when I list the items. Piece of cake."

Oops. It doesn't seem to work that way.
I've done a little C and C++, considerable FORTRAN
and COBOL and great gobs of 360/370 Assembler and
REXX but it looks like Java is a Different Beast.
I could, of course, download one of the free
shopping cart applications but that really woudn't
teach me anything.

I'm going to include what I have so far and would
any kind soul give me a pointer or two?

// JavaScript Document

function e_initialize() {
    alert('Initialize script called.');

    e_cart_numz = new Array(100);
    e_cart_descr = new Array(100);
    e_cart_price = new Array(100);

    for (index = 0; index < 100; index++)
        { e_cart_numz[index] = -1;
         e_cart_descr[index] = "";
         e_cart_price[index] = 0; }
    }

function e_add_cart (number, description, price) {
    var e_cart_numz;
    var e_cart_descr;
    var e_cart_price;

    alert('e_add_cart called.');
    alert('number="'+number+'"');
    alert('description="'+description+'"');
    alert('price="'+price+'"');

    var count = e_cart_numz.push(number);
        count = e_cart_descr.push(description);
        count = e_cart_price.push(price);

    return count; }

function e_del_cart (index) {
    var e_cart_numz;
    var e_cart_descr;
    var e_cart_price;

    alert('e_del_cart called.');

      e_cart_numz[index] = -1 ;
      e_cart_descr[index] = "" ;
      e_cart_price[index] = 0 ;

    return ; }

--
-- Marten Kemp
(Fix name and ISP to reply)