Here are the main guidelines to make sure that your Web site's content can be properly indexed by the main search engines and ranked accordingly:
A. Optimal Spiderability
When they crawl your site, search engines use automated robots sometimes referred to as bots or spiders which follow the link structure of your site in order to find all the pages and add their content to the search engines index. If your website has a lot of non-HTML content for example Flash or Java plug-ins then it will be very difficult for the search engines spider to index these elements and you must make sure that you offer alternative text links in HTML purely for the spiders to index.
B. Avoid Forcing The Submission of Forms
it is always a bad idea to have a navigation system mainly based upon drop-down menus or select boxes as once again this will cause problems for the search engine spiders. If you must use them and make sure once again that you recreate the links in HTML format so that the spiders may gain access. This also applies to content which can only be accessed via a search function as search engine spiders are not able to search some such content will remain inaccessible to the engines.
C. Do Not Use Frames
If you insist on using framesets in your Web designs or websites then use internal iframes in preference. A search engine will find it very difficult to properly index a site which is mainly constructed using frames.
A Guide to Search Engine Friendliness contd.