wordpress plugin - Parameter

Hi, I am looking for a wordpress plugin solution for a problem I have... I need to store a URL parameter in a session in my wordpress site, so it can be retrieved later. for example, a visitor enters my wordpress site at: [login to view URL] For clarity lets call this the INCOMING PARAMETER And I need to store that value from "hop" (in this example "1234") and use it later in the session. After my user signs up to my mailing list etc, they will be redirected to: [login to view URL] and on this page, I need to recall the INCOMING PARAMETER and use it in a link/image like this: [login to view URL][value from "hop"] For Clarity lets call this the OUTGOING URL I need a menu where I can enter the INCOMING PARAMETER name, select an image to use in the link, and then set the OUTGOING URL and then a shortcode for that Image/Link so I can display it on my page. Please only bid after reading and understanding what I am looking for. Please, no unrated or non english speaking freelancers. Thanks.