Use GET vars with JS

getVars.js

// Read the GET variables
var $_GET = {};
document.location.search.replace(/\??(?:([^=]+)=([^&]*)&?)/g, function () {
  function decode(s) {
    return decodeURIComponent(s.split("+").join(" "));
  }
  $_GET[decode(arguments[1])] = decode(arguments[2]);
});

// Use the GET variables
if (typeof $_GET['something'] !== 'undefined') {
  // Do something with $_GET['something']
}