fixes #2243

app/assets/javascripts/default/cookie.js

@@ -0,0 +1,62 @@
+(function() {
+  Danbooru.Cookie = {};
+
+  Danbooru.Cookie.put = function(name, value, days) {
+    if (days == null) {
+      days = 365;
+    }
+
+    var date = new Date();
+    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+    var expires = "; expires=" + date.toGMTString();
+    document.cookie = name + "=" + encodeURIComponent(value) + expires + "; path=/";
+  }
+
+  Danbooru.Cookie.raw_get = function(name) {
+    var nameEq = name + "=";
+    var ca = document.cookie.split(";");
+
+    for (var i = 0; i < ca.length; ++i) {
+      var c = ca[i];
+
+      while (c.charAt(0) == " ") {
+        c = c.substring(1, c.length);
+      }
+
+      if (c.indexOf(nameEq) == 0) {
+        return c.substring(nameEq.length, c.length);
+      }
+    }
+
+    return "";
+  }
+
+  Danbooru.Cookie.get = function(name) {
+    return this.unescape(this.raw_get(name));
+  }
+
+  Danbooru.Cookie.remove = function(name) {
+    this.put(name, "", -1);
+  }
+
+  Danbooru.Cookie.unescape = function(val) {
+    return decodeURIComponent(val.replace(/\+/g, " "));
+  }
+
+  Danbooru.Cookie.initialize = function() {
+    var loc = location.href;
+
+    if (loc.match(/^http/)) {
+      loc = loc.replace(/^https?:\/\/[^\/]+/, "");
+    }
+
+		if (this.get("hide-upgrade-account") != "1") {
+ 	    $("#upgrade-account").show();
+		}
+  }
+})();
+
+$(function() {
+  Danbooru.Cookie.initialize();
+});
+