gistfile1.js

(function(ns) {
var r = typeof window != 'undefined' ? window : this;
[].forEach.call(ns.split("×"), function(v) { r = r[v] = {} })
})("mattn×hasegawayosuke×tokuhirom")

mattn.hasegawayosuke.tokuhirom.Miyagawa = function() {
    alert('×××')
}

mattn.hasegawayosuke.tokuhirom.Miyagawa()

// Another 
var namespace = function (ns_string) {
    var parts = ns_string.split('.'),
            parent = typeof window != 'undefined' ? window : this,
            i;
    // strip redundant leading global
    if (parts[0] === parent.toString()) {
        parts = parts.slice(1);
    }
    for (i = 0; i < parts.length; i += 1) {
        // create a property if it doesn't exist
        if (typeof parent[parts[i]] === "undefined") {
            parent[parts[i]] = {};
        }
        parent = parent[parts[i]];
    }
    return parent;
};
namespace("mattn.hasegawayosuke.tokuhirom");
mattn.hasegawayosuke.tokuhirom.Miyagawa = function() {
    alert('ouffu')
}

mattn.hasegawayosuke.tokuhirom.Miyagawa()