title: event.wheelDelta returns undefined
body: <p>So I'm trying to disable scrolling on my page when my lightbox opens, and I found this really usefull script that does exactly that. (<a href="http://jsfiddle.net/mrtsherman/eXQf3/3/">http://jsfiddle.net/mrtsherman/eXQf3/3/</a>), unfortunately, when I use it on my own page, it disabled scrolling in my lightbox as well. I started to debug the code with alerts only to find out that event.wheelDelta returns "undefined" on my page, while in the <a href="http://jsfiddle.net/eXQf3/19/">JSFiddle</a>, it returns -120.</p>