Session Variable

I'm using on my shopping cart a session variable to store all products that user have put in to the cart.
The script that I use is writen from a book that I bought. I managed to edit the script so that It suites me.
But I have a problem., The book don't tell how to do the checkoutfunction. How can I get all values from the session variable and storethem to my database.
Major problem is that I don't know how to do the for loop that shouldreed the session variable and give value to the parameters.
Session variable (cart) have following variables stored (cartid:integer, PID:integer , PAKID:Integer , Productname:String , Quantity:integer ,Price:Decimal)
Please Help me with this.
If you download the source code for the Commerce Starter Kit from the "Starter Kits" tab on this web site, it has a great example on how to handle storing items in a shopping cart, and then handling the checkout.
smtraber
It's prity big I'm not so good at coding. I have mostly of my time used Dreamweaver.

<%

For Each Cartid in Session("cart")

       Response.Write cartid & "=" & Session("cart") & "<br>"

Next

%>
Wuold this work to print the cartid in the session cart.
I have in the session following strings also: PID,PAKID,quantity all integer and price as decimal and productname as string
How should I insert the code into this for each loop so I would get value of all the variables in the session varibale