Writing HTML Content to a Webpage's DOM with a C++ BHO

The entire process of creating an Addon in Internet Explorer is explained in this article. The Addon will place an ad in every page opened by the browser. The ad will be made in HTML/CSS and will be written to the page's DOM when the page is loaded. Coding is done in C++ is to remove the .NET dependency. The final goal of this sample is to write a with absolute position with a background image and another acting as a close button.