JavaScript: Get url parameters

script.js

var $_GET = {};
if(document.location.toString().indexOf('?') !== -1) {
    var query = document.location
           .toString()
           // get the query string
           .replace(/^.*?\?/, '')
           // and remove any existing hash string (thanks, @vrijdenker)
           .replace(/#.*$/, '')
           .split('&');

    for(var i=0, l=query.length; i<l; i++) {
       var aux = decodeURIComponent(query[i]).split('=');
       $_GET[aux[0]] = aux[1];
    }
}