Wondering how to achieve this effect?

[Mark__G]

I can't figure out how they got the hover over blue glow effect on nintendo's website below the main navigation tabs.

The css div code is there but in the page source there is no div with the "glow" name? I can't figure out how they are calling the glow div section? Is it a javascript function?

www.nintendo.com

[Twey]

Yes, it's JS (only visible on the American site).

[Mark__G]

I can't figure out which javascript file it is?