"

From 2013.igem.org

/**

* onScrollChange (oSch) event handler
* @version onScrollChange 1.0
* @copyright Copyright (c) 2010-2012, Gabriele Girelli
* @author ggirelli <g.girelli@studenti.unitn.it>
*/

function oSch(event) {

   var lastScroll = $("#tn-main-wrap-wrap").scrollTop();
   (function listenTime() {
       var scroll = $("#tn-main-wrap-wrap").scrollTop();
       if (scroll !== lastScroll) {
           event();
           lastScroll = scroll;
       }

       var t = setTimeout(listenTime, 100);

   })();

}