Net-surfers rarely take the time to read an entire Web page. Instead, they scan across the screen for relevant information. Yet, human beings can process only so much information at a time. With cluttered Web pages, visitors must wade through dozens or hundreds of links in order to find that one path to the information they desire.
Anything designers can do to aid the visitor's ability to scan through a page (organising links in lists and showing the lists only when the visitor needs them) will improve the usability of their website.
First, we set up a frames document with a thin frame stretching across the top of the window that will hold our menu(s), and then a larger frame underneath to display our content:|