web page segmentation

Question

hi..
As a part of my project I have to segment the web page into several parts. I have now created a browser. What I need is , when I click a button, the web page must be divided into different parts. Once the  button is clicked, the rest action is taking place using the page source of that web page. Is there any method to display some rectangles using c#.net over the different segments of the web page? I am planning to divide the web page based on the tags.