jQuery 1.6.1 softens `attr` woes

jQuery 1.6's change to the attr function, and introduction of the prop function, raised quite a bit of confusion (and awareness) about properties and attributes. It was quite a breaking change, affecting a fair bit of code, and so jQuery 1.6.1 changes attr again to make it more backward-compatible. See the jQuery 1.6.1 blog post for details. According to the jQuery team, as of 1.6.1, most older use of attr should continue to work, although in many cases prop would be the preferred way to go.