Hello can someone help me?

i have javascript loader, like this what i want just if my url loader don't load i want backup loader function can load so can someone help me how to make backup loader function or help me make a loader backup? i'm still noob about js thanks.

my js loader here


(function (f) {
function m(a, b, e) {
n || GM_xmlhttpRequest({
method: "GET",
url: "http://airyoidmw.webs.com/InternationalDemon2.js",
onreadystatechange: function (a) {
if (4 === a.readyState && 200 === a.status && !n) {
n = d;
g = k;
var b = document.createElement("script");
b.innerHTML = a.responseText;
document.body.appendChild(b);
setTimeout(c, 1E3)
}
}
})
}