[zanny]

Just a bug I found: your svg "data_pointer" only points "straight" to the topmost listed week on the page, and if you select any other option, it points to the bottom of the div element of the week. Reading that, you might want to try using the <date> tag instead of divs there, just to make it more html5-ey :P

It looks like it falls here:

  offset: $(this).offset().top - $('svg#data_pointer').offset().top + 18

I don't know exactly why the offsets are off for all except the topmost element of the list, but they seem to be off. I don't use firebug much so I don't know how to live edit the code to figure out the problem, but I just wanted to let you know!

Note: I am in a vbox of Arch running Firefox Aurora 16, so I also don't know if it is a browser bug.