Feature/use prop

Thanks for the branch tip, I'm still learning about git/github workflows (this was my first pull request ever).  I'm guessing this branch will get deleted if/when it gets merged into master.

This uses .prop when working with disabled, and updates the test to work in Chrome & Firefox.

I also fixed a test failure for IE7.  Its attr(href) returns the full path instead of the literal attribute content, so now getPostData explicitly looks for stuff after # instead of just chopping off the first character.