throttle.js

var throttle2 = function(fn, threshhold, scope) {
        var time, last = 0, handle,
            args = arguments;
        threshhold = threshhold || 250;
        return function() {
          var that = this;
          time = +new Date();
          if ((time - last) > threshhold) {
            last = time;
            // console.timed_log('ran');
            clearTimeout(handle);
            fn.apply(scope || that, args);
          } else {
            clearTimeout(handle);
            handle = setTimeout(function(){
              last = time;
              // console.timed_log('ran witheld');
              fn.apply(scope || that, args);
            }, threshhold);
            // console.timed_log('witheld');
          }
        };
      };