Code from StackOverflow to pull out url query strings in pure JavaScript

gistfile1.js

//http://stackoverflow.com/questions/11582512/how-to-get-url-parameters-with-javascript/11582513#11582513
function getURLParameter(name) {
    return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [,""])[1].replace(/\+/g, '%20')) || null;
}