function
doSubmit()
{
	if (validateCustomerDetails() == false)
	{
		alert("Required entries missing in Step 1");
		return;
	}

	if (validatePizzaSize() == false)
	{
		alert("Required entries missing in Step 2");
		return;
	}

	if (validatePizzaToppings() == false)
	{
		alert("Required entries missing in Step 3");
		return;
	}

	alert("Your pizza order has been submitted...");
	return;
}
function validateCustomerDetails()
{
	var customer, address, phone, email;
	customer = document.order_form.customer.value;
	address = document.order_form.address.value;
	phone = document.order_form.phone.value;
	email = document.order_form.email.value;

	if (customer.length == 0)
		return false;
}
function validatePizzaSize()
{
	if (document.order_form.sizes[0].checked)
		return true;
	if (document.order_form.sizes[1].checked)
		return true;
	if (document.order_form.sizes[2].checked)
		return true;

	return false;
}
function validatePizzaToppings()
{
	if (document.order_form.toppings[0].checked)
		return true;

	return false;
}
function doClear()
{
	document.order_form.customer.value = "";

	document.order_form.sizes[0].checked = false;

	document.order_form.toppings[0].checked = false;
}