Wrapper to disappear on scroll

So this is the total opposite of the top fixed wrapper (which is also a great tool - thanks Ced). I would like to be able to set a wrapper to disappear as a visitor starts to scroll. See clarkheatandcool.com/ where the top bar disappears on scroll.

Hi
you can use the topfixed feature which adds a CSS class on the wrapper, then with custom CSS you can decide to hide it with a display:none

CEd

Thanks Ced. I understand the how of it working, but I'm not sure exactly how to add the display:none;. If I add it to the Custom CSS for the wrapper, as expected, it disappears immediately. So I suspect I need to add it to some other class elsewhere, but I have been unable to locate which this is.

please give me the url of the page so that I can check and tell you

Actually, on doing some more thinking about this, the way I described makes no sense as I just realized that, in addition to making the one wrapper disappear, a second one remains fixed, which, of course, I cannot do (2 fixed wrappers). Then, embarrassingly, I realized that making the top wrapper disappear on scroll is a simple as... doing nothing! DOH!!

What I'd rather do is, on scroll, swap out the first visible logo for a smaller one to reduce the depth of the header wrapper. I don't think there's anything in the standard TC that will do that without some custom CSS. Just what that CSS I have no clue!

lol
if you need my assistance in the css for the logo, give me the url of the page