Looking good so far. You're probably working on it, but I've noticed that you don't allow the slider to move while the effect is not done...which is ok (tho could get some improvement, like making the arrow seem "disabled" while it's not clickable). But when you use the back and foward buttons in the browser, it gets messy. For example, clicking Back multiple times when you're in the last tab, will show #gid1 in the address bar but actually show tab 2 or 3.
Also, as a feature suggestion...tabs take too long to load (I suppose you're pre-loading all the images). I think it will feel more fluid and responsive if you bring in the images before loading, then show a "loading" gif on each thumbnail...then show each individual image as they load. Sorry for my horrible english, btw!
