Custom PHP programming

I have an existing PHP script that I need changed. I need to add more functionality to it and also need to ensure that the admin and configuration areas of the script are secure from hacking. The current PHP script allows users to upload photos and automatically resizes the pictures. I would like to have the script changed so that it resizes the picture but also keeps the original. The script also has fields that let the user enter information about the picture, I would like to edit these to allow for more information. Thanks. ## Deliverables I am using the Gpix script by [login to view URL], found here <[login to view URL]> I want to add the following features to the script 1. Save original picture when the user uploads it as well as resize the picture that is displayed. 2. When a user clicks the picture it takes them to the users website. I want to chage this so that when a user clicks a picture a popup window opens that displays a larger version of the picture along with a short paragraph that the user can define. 3. I need to secure the [login to view URL] script as well as the paypal payment gateways to protect against hacking.