JS written source code and SEs/spiders

what will the SE/spider do?

[createErrorMsg]

I am working on a site that dynamically writes navbar content to the page in different locations, depending on browser type and user choices. I am new to the SE end of web design and have a question.

I would like to know what effect the javascript will have on how the site interacts with SEs and spiders. Will they have access to that content or not? I have heard that it's an important thing to have your navigation system accessible to spiders, etc, but don't know how they treat/react to JS written code.

Thanks in advance for any tips.

[isitreal]

Treat javascript of any kind as if it does not exist on the page a far as a spider is concerned.

In another thread, a guy was using javascripted drop menus, including main nav items, but also put in a <noscript>version of the nav bar, which is an ok solution I guess since spiders will follow that fine as far as I know, personally I wouldn't use javascript to create any menu.