Updated jQuery and did some minor cleanup

Hi, I updated jQuery from 1.3.2 to 1.10.1. To do so, I removed the IE 6 browser detection. I updated index.html to use the new jQuery, and changed the path of the default loader image so that index.html could find it.

I also did a few miscellaneous things: I made two variables local, changed the image not found message to console.log from alert, added a second console.log right after that first message with the path of the image it was trying to load, and changed tabs to spaces.