Hello, i am creating a web page in Kompozer and i want to add a menu bar that resizes itself depending on the size of the browser. The best example i can think of is right here on this website. When you change the size of your brwoser, the red bars on top of each post/thread resize and its contents shift along the bar! how do you do that? another example could be this web page : www.f3music.com. As you can see, the top green bar resizes with the browser window. How can i do this?

thanks in advance