Parse QUERY_STRING.

parse_query.js

// "?a=1&a=2&b=x&c=%2A&d=&=y&=&==&%2A=3&" -> Object {a: "2", b: "x", c: "*", d: "", %2A: "3"}
var q = (function(){
    var q = {};
    window.location.search
        .substring(1)
        .split('&')
        .filter(function(a){
            return a.indexOf('=') > 0;
        })
        .forEach(function(a){
            var p = a.split('=');
            q[p[0].trim()] = decodeURIComponent(p[1]).trim();
        })
    ;
    return q;
})();