Parse URL query string in JavaScript

parseWindowLocationQuery.js

/** 
* sets window.location.query, which is a hash with all parameters
* param names are all lowercase
* reference as window.location.query.myparameter
*/
(function parseWindowLocationQuery(w){
  var d=decodeURIComponent,
      q=w.location.query=w.location.query||{},
      pairs=w.location.search.substr(1).split('&'),
      i;
  while(i=pairs.pop()) {
    var keyValue=i.match(/([^=]*)=?(.*)/)
    if(keyValue) q[d(keyValue[1]).toLowerCase()]=d(keyValue[2]);
  }
})(window);