Adding a new section (icon) to cpanel

Hi there.
I'm going to be writing my own affiliate program that will allow my users to add links to their site and earn "referral bonuses" every time a new user clicks through their site and signs up for hosting.

However, to make it easier for the user, I want to have code that generates the HTML links to place on their pages.

Soo....

I want to know the easiest way to add a new section and icon to my users' cpanel interface. When they click on the icon, they will be presented with a box where they can cut and paste HTML code that is specific to their domain name so that they can get referral bonuses. I already have the code in place to generate the HTML, I just need to know the best way to add this into cpanel. Is there a tutorial somewhere?

Thank you