Create Navigation Systems that Search Engines Can Read

When building your navigation system, make sure search engines can "read" it. Sometimes, what we want to do is to use rollover effects or flash buttons to make make it looks fancy and "high-class". However, if you create your navigation system in that way, it will be invisible to search engines. Because usually these techniques requires the use of Java script, which is something that seach engine robot will ignore. If you do want to use Java scripts to create some eye-catching effects, then follow some tips below:
1. Make sure you have the text link appear on some other places in the same page
2. Don't throw all your Java script into one page, make an external file to store the script, and use php code point to the files that contain the Java scripts. (I also have a blog talking about php)
3.When you use images as buttons, make sure write the corresponding alt tag for image

In some other cases, you may want to block search engine robots crawling your page when you have a page that is under construction or that page is only for internal uses, then you use the following code:
META NAME=”robots” CONTENT=”noindex, nofollow”
here, noindex means don't index the page and nofollowing means don't follow any of the links in this page.