Site navigation is the only means by which a search engine or a visitor can find the important parts of your website. But your navigation system must be carefully planned to yield maximum results.
Text format. It is best if all navigation is in a text format that can be read by search engines. If you're not sure if the text you see is readable, try highlighting the text with your mouse. If you are able to highlight it, then it is readable by search engines.
Drop-down menus. If you are considering a fancier menu that has drop-down elements, make sure this technology is as search engine friendly as possible. I recommend using menus created with Cascading Style Sheets (CSS) for best results. Flash and JavaScript menu systems cannot be easily followed by search engines unless the website developer is extremely careful.
clipped from: www.ozelwebtasarim.com