Get url parameters with Javascript

get_url_parameters.js

function getURLParameters(url) {

  var result = {};
  var searchIndex = url.indexOf("?");
  if (searchIndex == -1 ) return result;
  var sPageURL = url.substring(searchIndex +1);
  var sURLVariables = sPageURL.split('&');
  for (var i = 0; i < sURLVariables.length; i++)
  {
    var sParameterName = sURLVariables[i].split('=');
    result[sParameterName[0]] = sParameterName[1];
  }
  return result;
}