Read query string parameters from javascript

Read query string parameters from javascript.
Here is script demonstrating it:

var qsParm = new Array();
        function qs() {
        var query = window.location.search.substring(1);
        var parms = query.split('&');
                for (var i=0; i<parms.length; i++) {
                        var pos = parms[i].indexOf('=');
                        if (pos > 0) {
                                var key = parms[i].substring(0,pos);
                                var val = parms[i].substring(pos+1);
                                qsParm[key] = val;
                        }
                }
        }