Lets understand search engines and how they work first.
A search engine provider is nothing more than a database. We will be concentrating our efforts on the Robots and ensuring our sites can be seen by them. With out meta's In the absence of an other special information such as meta's, search engines will index all the words in your document. It will then use the top section of your document as a point of info gathering. This will include photo's, banners, and most java scripting in some cases .