gistfile1.js

function parseq(s) {
    var o = {};
    s.split("&").map(function (e) {
        var
            p = e.indexOf("="),
            t = [e.substring(0, p), e.substring(p + 1)],
            m = /^(\w+)\[['"](\w+)['"]\]$/.exec(t[0]);

        if (m) {
            o[m[1]] = o[m[1]] || {};
            o[m[1]][m[2]] = t[1];
        } else {
            o[t[0]] = t[1];
        }
    });
    return o;
}