Read the querystring from javascript

querystring.js

// Adapted from http://stackoverflow.com/questions/901115/get-query-string-values-in-javascript
// Give a querystring like this: yourpage.html?cheese=wensleydale&biscuits=nice

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('&'));

console.log(qs['cheese']);  // outputs 'wensleydale'