document.cookie = "testcookie";
var cookieEnabled = (document.cookie.indexOf("testcookie") != -1) ? true : false;

if (!cookieEnabled && document.location.pathname != "/enable-cookies.aspx") {
 document.location = "/enable-cookies.aspx";
}

else if (document.location.pathname == "/enable-cookies.aspx" && cookieEnabled) {
 document.location = "/";
}