After some testing I\'m noticing that event.stopImmediatePropagation() does not work in IE (per usage below). However, it works in Chrome, FF, Safari, and Opera. What gives?
IE has supported stopImmediatePropgation since IE 9 (http://msdn.microsoft.com/en-us/library/ie/ff975461(v=vs.85).aspx), but jquery is the problem.
The jquery version used in your code is not working. This jsfiddle works perfectly in IE, and the code is exactly the same. The ONLY difference is that it uses jQuery 1.9.1 instead of jQuery 1.8.3