// Cookies zu Testzwecken anlegen:
document.cookie = "test123=wert123";
document.cookie = "test456=wert456";
document.cookie = "test789=wert789";

console.log("document.cookie: ", document.cookie);
// "test123=wert123; test456=wert456; test789=wert789"

var cookiesRaw = document.cookie.split(";");

console.log("cookiesRaw: ", cookiesRaw);
// ["test123=wert123", " test456=wert456", " test789=wert789"]

var cookies    = {};
for (var name, value, i = 0, x = cookiesRaw.length; i < x; ++i) {
	name  = cookiesRaw[i].split("=")[0].replace(/^\s+/, ""); // mit ltrim(), test123
	value = cookiesRaw[i].split("=")[1]; // wert123
	cookies[name] = value;
}

console.log("cookies: ", cookies);
// { test123: "wert123", test456: "wert456", test789: "wert789" }

if (typeof cookies["test123"] != "string") {
	console.log("Kein Treffer für test123");
} else {
	console.log("Treffer test123: ", cookies["test123"]);
}

if (typeof cookies["xyz123"] != "string") {
	console.log("Kein Treffer für xyz123");
} else {
	console.log("Treffer xyz123: ", cookies["xyz123"]);
}