Get Query String Values

QueryString.js

// http://stackoverflow.com/a/3855394
var qs = (function(a) {
    if (a == "") return {};
    var b = {};
    for (var i = 0; i < a.length; ++i)
    {
        var p=a[i].split('=');
        if (p.length != 2) continue;
        b[p[0]] = decodeURIComponent(p[1].replace(/\+/g, " "));
    }
    return b;
})(window.location.search.substr(1).split('&'));

//With an URL like ?topic=123&name=query+string, the following will return:

//qs["topic"];    // 123
//qs["name"];     // query string
//qs["nothere"];  // undefined (object)