'Sticky' Menu jQuery

Hello! I’m trying to install a ‘sticky’ or fixed menu to my WordPress as per this demo. The method on doing so is here. I’ve been trying to apply it, with no success.

I’m not quite sure how to place new div containers around my menu so I’ve just been using #menu-main and .menu-main-container in place of everything that’s in the code (i.e. #stickynavigation).

I’ve also replaced all the instances of a ? with ‘jQuery’.

Unfortunately, since I am working on a local server I am unable to show you a live version. I should probably also point out that I’m using Thesis by DIYThemes and I’ve asked this question over there already, but haven’t been given directions that give me what I specifically need from this code. If you could match me up with any other code that catches the menu upon scroll (opposed to hesitating and catching the menu with a delay) as effectively as this one, that’s all I’ll need.

Thank you!