Activate function on scroll

I want to build a Tumblr-like slider (http://www.tumblr.com/), that when the browser detects a scroll attempt it does something, in my case it'll run a function.

I can use $(window).scroll(function(){ /* ... */ });, but it won't work normally (it will be too fast). How can I do that it allows one scroll at a time and then stop it for 2 seconds to let it finish the animation?

Thanks.