Oh didn't see this update, yeah man you're doing really well, I think it's going good, you've already got the element, and the triangle, now you just have to get it to update some dom element (or ideally, update some observable that has a DOM element somewhere -- knockoutjs style) -- and do some calculations!

Awesome progress, I said it seemed easy, but everything gets complicated once you actually start doing it, good luck!

BTW, JSFiddle is pretty amazing. lemme know if you get stuck, send me a PM or something and I'll help out!