I finished the javascript for the bandwidth chooser. It's pretty simple javascript, but you'll need to set a cookie based on what it's doing. I've already setup a section for you to do so. On line 330 you'll see this:

if($(this).hasClass('high')){
//set cookie for high quality
}else{
//set cookie for low quality
}

That's basically just checking which quality tab was clicked.

The other thing is that you'll need to hide the appropriate div based on the cookie being read in. If you can stub out the cookie being red in, I'll wire up the hide/show logic if you like, or you can handle that stuff.