javascript debounce function

debource.js

(function($, sr){

  // debouncing function from John Hann
  // http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
  var debounce = function (func, threshold, execAsap) {
    var timeout;

    return function debounced () {
      var obj = this, args = arguments;
      function delayed () {
        if(!execAsap)
          func.apply(obj, args);
        timeout = null;
      }

      if(timeout)
        clearTimeout(timeout);
      else if(execAsap)
        func.apply(obj, args);

      timeout = setTimeout(delayed, threshold || 100);
    };
  };

  // smartresize
  jQuery.fn[sr] = function(fn) {
    return fn ? this.bind('resize', debounce(fn)) : this.trigger(sr);
  };

}) (jQuery, 'smartresize');