Use jquery.cookie

app/assets/javascripts/application.js

@@ -2,6 +2,7 @@
 //= require jquery_ujs
 //= require jquery.autogrowtextarea
 //= require jquery.timers
+//= require jquery.cookie
 //= require augment
 //= require openlayers
 //= require i18n/translations

app/views/site/index.html.erb

@@ -227,7 +227,7 @@ end
     updatelinks(lonlat.lon, lonlat.lat, zoom, layers, extents.left, extents.bottom, extents.right, extents.top, objtype, objid);
 
     expiry.setYear(expiry.getFullYear() + 10);
-    document.cookie = "_osm_location=" + lonlat.lon + "|" + lonlat.lat + "|" + zoom + "|" + layers + "; expires=" + expiry.toGMTString();
+    $.cookie("_osm_location", [lonlat.lon, lonlat.lat, zoom, layers].join("|"), {expires: expiry});
   }
 
   function remoteEditHandler(event) {

vendor/assets/jquery/jquery.cookie.js

@@ -0,0 +1,72 @@
+/*jshint eqnull:true */
+/*!
+ * jQuery Cookie Plugin v1.2
+ * https://github.com/carhartl/jquery-cookie
+ *
+ * Copyright 2011, Klaus Hartl
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://www.opensource.org/licenses/mit-license.php
+ * http://www.opensource.org/licenses/GPL-2.0
+ */
+(function ($, document, undefined) {
+
+	var pluses = /\+/g;
+
+	function raw(s) {
+		return s;
+	}
+
+	function decoded(s) {
+		return decodeURIComponent(s.replace(pluses, ' '));
+	}
+
+	var config = $.cookie = function (key, value, options) {
+
+		// write
+		if (value !== undefined) {
+			options = $.extend({}, config.defaults, options);
+
+			if (value === null) {
+				options.expires = -1;
+			}
+
+			if (typeof options.expires === 'number') {
+				var days = options.expires, t = options.expires = new Date();
+				t.setDate(t.getDate() + days);
+			}
+
+			value = config.json ? JSON.stringify(value) : String(value);
+
+			return (document.cookie = [
+				encodeURIComponent(key), '=', config.raw ? value : encodeURIComponent(value),
+				options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
+				options.path    ? '; path=' + options.path : '',
+				options.domain  ? '; domain=' + options.domain : '',
+				options.secure  ? '; secure' : ''
+			].join(''));
+		}
+
+		// read
+		var decode = config.raw ? raw : decoded;
+		var cookies = document.cookie.split('; ');
+		for (var i = 0, parts; (parts = cookies[i] && cookies[i].split('=')); i++) {
+			if (decode(parts.shift()) === key) {
+				var cookie = decode(parts.join('='));
+				return config.json ? JSON.parse(cookie) : cookie;
+			}
+		}
+
+		return null;
+	};
+
+	config.defaults = {};
+
+	$.removeCookie = function (key, options) {
+		if ($.cookie(key) !== null) {
+			$.cookie(key, null, options);
+			return true;
+		}
+		return false;
+	};
+
+})(jQuery, document);