throttling a window.scroll handler for better performance

gistfile1.js

// underscore's throttle-metod

 var throttle = function(func, wait) {
    var context, args, timeout, throttling, more, result;
    var whenDone = _.debounce(function(){ more = throttling = false; }, wait);
    return function() {
      context = this; args = arguments;
      var later = function() {
        timeout = null;
        if (more) func.apply(context, args);
        whenDone();
      };
      if (!timeout) timeout = setTimeout(later, wait);
      if (throttling) {
        more = true;
      } else {
        result = func.apply(context, args);
      }
      whenDone();
      throttling = true;
      return result;
    };
  };

/*
Old code:
$(window).scroll(function(e) {
// whatever
});
*/

// new code, break out scroll handler:

var myScrollHandler = function(e) {
//whatever
};

$(window).scroll(throttle(myScrollhandler, 50));