Somewhere along the lines recently, I took an interest in JavaScript programming. I wrote some bad JS code way way back in 1999 while working for a small, long gone ISP, but had spent very little time in it since. When I last wrote JS, there was no XHR, JSON, FireBug, JQuery, prototype.js, etc. Netscape was pushing some new “layers” thing that was supposed to be the basis of their DHTML implementation, and Microsoft was doing something completely different.