Querystring Parser

//----------------------------------------------------------
//Gets the querystring value for the specified key
$.querystring = (function(key,url){
	url = url || window.location.search;
	key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]"); 
	var regex = new RegExp("[\\?&]"+key+"=([^&#]*)"); 
	var results = regex.exec( url );
	return (!results)?"":decodeURIComponent(results[1].replace(/\+/g, " "));
}).bind($);