Simple query parsing

getQueryParams.js

function getQueryParams(qs) {
  qs = qs.split('+').join(' ');
  
  var params = {},
  tokens,
  re = /[?&]?([^=]+)=([^&]*)/g;
  
  while (tokens = re.exec(qs)) {
    params[decodeURIComponent(tokens[1])] = decodeURIComponent(tokens[2]);
  }
  
  return params;
}
document.params = getQueryParams(window.location.href);