File Sizes and Search Engine Optimization.
You should consider the size of your website files both for the benefit of
search engines and your visitors.
Obviously, you want your visitors to be able to get your website to load fast,
but you need to help the search engines as well.
You can reduce the file size in a couple of ways:
1.) Use External Style Sheets
2.) Use Validated Code
3.) Cut out all the junk
Most search engines spiders don't read Javascript unless you include it from another page, so consider making all your menus real hyperlinks with anchor text. Your pages will load faster and the SE's will be happier.
Reducing the size of your pages will help with your overall search engine optimization.