Don't want Popups from Nav Bar! How can this be done?

Hi

I've got a couple of Nav bars on my site and I'm getting text popping up when the cursor is in certain areas. I think this is the Pop Up menus, so it if is, then I can't seem to switch it off

See the image attached to show you what I mean.

Thanks

Attached Images

nopop.JPG (58.3 KB)