CS-Cart - Special invoice number addon

Avg Bid (EUR)
Project Budget (EUR)
€50 - €100

Project Description:
We need special invoice numbers on invoices in CS-Cart.

Normally cs-cart gives invoices a number like #1, #2, #3, etc...
I want every year a new range, for example : GB20120001, GB20120002, etc
Next year automatically : INV20130001, INV20130002, etc...

We want a full manual how to change it in CS-CART so we can do it by our selves.
So you have to give instructions like :
- open file with filename "filename"
- Search for text "text-code"
- Replace by text : "new text-code"
Also MySQL changes must be in manual.

We want 2 variables set in config-file :
- Prefix, like INV in example.
- Number of positions after year-stamp. So, when admin put this on 6, you get : [prefix][year]000001 as first of the year.
If you put this on 4, you got : [prefix][year]0001

This number must replace order_id in all invoices. (Printed invoice by admin, but also email-invoices to clients)

We want the full copyrights of this changes.
We will pay only after finish project with 100% satisfaction.
We want invoice of your company after finishing the project.

Skills required:
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€ 100
in 2 days