## implementation
        resolvePath: function (path, referrerLocation) {
            var pathDirs = path.split("/");
            var fileName = pathDirs.pop();

            var locationDirs = referrerLocation.split("/");
            locationDirs.pop();

            for (var i = 0, il = pathDirs.length; i < il; i++) {
                var spec = pathDirs[i];
                if (spec === "..") {
                    locationDirs.pop();
                } else {
                    locationDirs.push(spec);
                }
            }

            locationDirs.push(fileName);
            return locationDirs.join("/");
        },

## tests
    "test resolve path": function () {
        var e = new JSEpub();
        assertEquals("images/foo.jpg", e.resolvePath("../images/foo.jpg", "css/test.css"));
        assertEquals("images/foo.jpg", e.resolvePath("../../images/foo.jpg", "css/stuff/test.css"));
        assertEquals("images/foo.jpg", e.resolvePath("../css/../images/foo.jpg", "css/test.css"));
        assertEquals("foo.jpg", e.resolvePath("../foo.jpg", "css/foo.css"));
        assertEquals("css/foo.css", e.resolvePath("foo.css", "css/foo.css"));
    }