var hashListener = {

	ie:		/MSIE/.test(navigator.userAgent),

	ieSupportBack:	true,

	hash:	document.location.hash,

	check:	function () {

		var h = document.location.hash;

		if (h != this.hash) {

			this.hash = h;

			this.onHashChanged();

		}

	},

	init:	function () {



		// for IE we need the iframe state trick

		if (this.ie && this.ieSupportBack) {

			var frame = document.createElement("iframe");

			frame.id = "state-frame";

			frame.style.display = "none";

			document.body.appendChild(frame);

			this.writeFrame("");

		}



		var self = this;



		// IE

		if ("onpropertychange" in document && "attachEvent" in document) {

			document.attachEvent("onpropertychange", function () {

				if (event.propertyName == "location") {

					self.check();

				}

			});

		}

		// poll for changes of the hash

		window.setInterval(function () { self.check() }, 50);

	},

	setHash: function (s) {

		// Mozilla always adds an entry to the history

		if (this.ie && this.ieSupportBack) {

			this.writeFrame(s);

		}

		document.location.hash = s;

	},



	setVar: function (var_name,var_value) {

	

		var ret_array = new Array();

		var ret_string="";

		var str = document.location.hash;

		

		var str_1 = str.split("?");

		//Här failar det

		if(str_1[1])

		{	var str_2 = str_1[1].split("&"); }

		else { str_2 = new Array(var_name+'='+var_value); }

		

		var is_in_hash = 0;

		

		for(var i = 0; i < str_2.length; i++)

		{

			var tmp = str_2[i].split("=");

			

			if(tmp[0] == var_name)

			{

				tmp[1] = var_value;

				ret_array.push(tmp[0]+"="+tmp[1]);

				is_in_hash=1;

			}

			else

			{

				ret_array.push(str_2[i]);	

			}

		}

		

		if(is_in_hash == 0)

		{

			hashListener.setHash(document.location.hash+"&"+var_name+"="+var_value);

		}

		else

		{

			for(var i = 0; i < ret_array.length; i++)

			{

				if(i == ret_array.length-1)

				{

					ret_string = ret_string+ret_array[i];

				}

				else

				{

					ret_string = ret_string+ret_array[i]+"&";

				}

			}		

			hashListener.setHash(str_1[0]+"?"+ret_string);

		}

	},



	getHash: function () {

	return document.location.hash;

	},

	writeFrame:	function (s) {

		var f = document.getElementById("state-frame");

		var d = f.contentDocument || f.contentWindow.document;

		d.open();

		d.write("<script>window._hash = '" + s + "'; window.onload = parent.hashListener.syncHash;<\/script>");

		d.close();

	},

	syncHash:	function () {

		var s = this._hash;

		if (s != document.location.hash) {

			document.location.hash = s;

		}

	},

	onHashChanged:	function () {}

};

hashListener.init();