// save the previous and current history locations, most browsers don't keep proper records when the back button is clicked
createCookie("history2", readCookie("history1"), 1);
createCookie("history1", document.location, 1);


//-- Cookie Helpers --
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime() + (days*24*60*60*1000));
		var expires = "; expires=" + date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}
function eraseCookie(name) {
	createCookie(name,"",-1);
}

//--- QueryString Helper ---
function Querystring(qs) { // optionally pass a querystring to parse
	this.params = {};
	if (qs == null) qs = location.search.substring(1, location.search.length);
	if (qs.length == 0) return;
	qs = qs.replace(/\+/g, ' ');
	var args = qs.split('&'); // parse out name/value pairs separated via &
	for (var i = 0; i < args.length; i++) {
		var pair = args[i].split('=');
		var name = decodeURIComponent(pair[0]);
		
		var value = (pair.length==2)
			? decodeURIComponent(pair[1])
			: name;
		this.params[name] = value;
	}
}
Querystring.prototype.get = function(key, default_) {
	var value = this.params[key];
	return (value != null) ? value : default_;
}
Querystring.prototype.contains = function(key) {
	var value = this.params[key];
	return (value != null);
}