How to Check if JavaScript is Enabled?

Is there a way in WordPress to check if JavaScript is enabled?

I’d like to use a different CSS file for the navigation (which currently works with jQuery) if JavaScript is disabled, so I can degrade the navigation bar gracefully to a CSS hover navigation bar, by simply changing the CSS file that is used.

Example:

if (javascript == on) {
jquery_navi.css
} else {
pure_css_navi.css
}