hide a div (and keep it hidden forever) when clicking a "close" link

hideAd.js

var COOKIE_DEF = "showAd=0", COOKIE_EXP = 365 * 24 * 60 * 60 * 1000; // 1 year
var display = (document.cookie || "").indexOf(COOKIE_DEF) == -1;
var $ad = $("#myAd").toggle(display);
$ad.find(".removeAd").click(function() {
	document.cookie = COOKIE_DEF + "; expires=" + new Date(Date.now() + COOKIE_EXP).toGMTString();
	$ad.animate({height:0}, function() {
	  $(this).remove();
	});
});