newbie css/js questions

i'd like to redo my current navbar to utilize the following:
minimalization of data transfer, reusability, and 'spice up'

i'm not very familiar with js, going to start digging though.

basically i have a couple of questions.

i have a fairly large site that is crawled by google, and i want to ensure that the js navbar will be crawled. is this possible with js to have a dynamically created navbar (and pages for that matter) crawled.

another question is the file size of typical js navbars. i'm currently sending possibly 13k. i can eliminate the need for some intermediate pages, but is going to a js navbar worth it in terms of data xfer, ability to crawl?

it doesn't really change the functionality of the site much, but allows for vertial/horizontal expanding menus which is a very nice feature.

i really hate to use frames, but i'd also prefer if the navbar was not loaded on every page. any thoughts about this? thanks for the input...

www.gt3times.com/view/

It's my knowledge that whatever shows up on the page after the page has finished loading is what is crawled. So if you have a dynamic external JS, it will be crawled if it appears on the page.