JavaScript: Get URL Parameter By Name

gistfile1.js

// Taken from http://stackoverflow.com/questions/901115/how-can-i-get-query-string-values
getParameterByName = function(name) {
  name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
  var regexS = "[\\?&]" + name + "=([^&#]*)";
  var regex = new RegExp(regexS);
  var results = regex.exec(window.location.search);
  if(results == null)
    return "";
  else
    return decodeURIComponent(results[1].replace(/\+/g, " "));
}