About the following image on the link i include shows the menu one the left hand side of a webpage, I would like to understand how the menu is made.

The blue faded line is the background image I know when rightmouseclick to see bckground image, but how its menu segments the picture in that way ?
The menu and all teh picture on teh left coded with javascript.

Would you please give me a piece of Css to cut the image like taht, this is very common in menu making, all pages taht have menu on the left like the image do so. I don't know how to deal with this.

http://www.sysinternals.com/

I know that page is a webtemplate origine but my purpose is to understand how that template menu is made.
Please help me,
Thanks a lot a lot

The best way to understand how they created the menu is to view the source code of the page itself. You can find the css for the page at:

http://www.sysinternals.com/includes/main.css

It doesn't look like they're using any javascript to create the menu.

The menu is contained inside a div with an id of navmaincontainer. If you look at the html inside that div and alternately look in the css you should be able to tell how they created the menu.