simple and extensible time manipulation

time.js

var time = (function() {
    var timeout = function(func, t) {
       function f() {
          // call the function and get the result
          var r = func.call(null);
          
          // should we recurse?
          if(r) setTimeout(f, t);
       }
       
       // schedule the first call
       setTimeout(f, t);
   }
   return {
     
     // how to implement a countdown from start and what to do when it ends.
     // pretty useful.
     countdown: function(start, fn) {
        timeout(function() {
           fn.call(null, start--);
           return start >= 0;
        }, 1000);
     },
     timeout: timeout
   }
})();