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/* Function to avoid javascript execute the funttion twice in the resize event */
		
var waitForFinalEvent = (function () {
  var timers = {};
  return function (callback, ms, uniqueId) {
    if (!uniqueId) {
      uniqueId = "Don't call this twice without a uniqueId";
    }
    if (timers[uniqueId]) {
      clearTimeout (timers[uniqueId]);
    }
    timers[uniqueId] = setTimeout(callback, ms);
  };
})();

//Usage:

$(window).resize(function () {
    waitForFinalEvent(function(){
      alert('Resize...');
      //...
    }, 500, "some unique string");
});

http://stackoverflow.com/questions/2854407/javascript-jquery-window-resize-how-to-fire-after-the-resize-is-completed

CMS's solution is fine if you only call it once, but if you call it multiple times, e.g. if different parts of your code set up separate callbacks to window resizing, then it will fail b/c they share the timer variable.

With this modification, you supply a unique id for each callback, and those unique IDs are used to keep all the timeout events separate.