Cross-Browser Debounce Resize

gistfile1.js

/*
Tested in: 

Chrome - 22 : Works
FF - 16     : Works
IE - 10     
IE - 9      : Works
IE - 8      : no alert - check at home
IE - 7      : no alert - ""
IE - 6      : posts alert twice
Opera -     : Works
Safari -    : Works

iPad
iPad Mini
iPhone
iPod

Android Tablet
Android Phone

Blackberry Phone
BB Playbook

Surface
Windows Phone 7.5
Windows Phone 8

*/

// Add and Remove Events
var event = {
	add: function(elem, type, fn) {
		if (elem.attachEvent) {
			elem['e'+type+fn] = fn;
			elem[type+fn] = function() {elem['e'+type+fn](window.event);}
			elem.attachEvent('on'+type, elem[type+fn]);
		} else
		elem.addEventListener(type, fn, false);
	},
	remove: function(elem,type,fn) {
		if (elem.detachEvent) {
			elem.detachEvent('on'+type, elem[type+fn]);
			elem[type+fn] = null;
		} else
		elem.removeEventListener(type, fn, false);
	}
}

// Debounce Function - http://davidwalsh.name/function-debounce
var debounce = function(func, wait, immediate) {
  var timeout;
  return function() {
    var context = this, args = arguments;
    var later = function() {
      timeout = null;
      if (!immediate) func.apply(context, args);
    };
    var callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, wait);
    if (callNow) func.apply(context, args);
  };
};


var logTest = function() {
 //console.log("test");
 alert("test");
}

// Run when DOM is ready
logTest();

// Debounce on resize
var logTestDB = debounce(function(e) {
 logTest();
}, 500); // Maximum run of once per 500 milliseconds

// Run on resize
event.add(window, "resize", logTestDB);