Get the url querystring value in Jquery

// Get the url querystring valuewindow.location.querystring = (function() {
var collection = {};
// Gets the query string, starts with '?'
var querystring = window.location.search;
// Empty if no query string
if (!querystring) { return { toString: function() { return ""; } }; }
// Decode query string and remove '?'
querystring = decodeURI(querystring.substring(1));
// Load the key/values of the return collection
var pairs = querystring.split("&");
for (var i = 0; i < pairs.length; i++) {
// Empty pair (e.g. ?key=val&&key2=val2)
if (!pairs[i]) { continue; }
// Don't use split("=") in case value has "=" in it
var seperatorPosition = pairs[i].indexOf("=");
if (seperatorPosition == -1) { collection[pairs[i]] = ""; } else { collection[pairs[i].substring(0, seperatorPosition)] = pairs[i].substr(seperatorPosition + 1); } }
// toString() returns the key/value pairs concatenated
collection.toString = function() { return "?" + querystring; };
return collection;})();
// End Get the url querystring value