/*----------------------------------------------------------------------------\
|                             Hash Listener 1.0                               |
|-----------------------------------------------------------------------------|
|                         Created by Erik Arvidsson                           |
|                  (http://webfx.eae.net/contact.html#erik)                   |
|                      For WebFX (http://webfx.eae.net/)                      |
|-----------------------------------------------------------------------------|
|   Basic object to allow updating the hash part of the document location.    |
|-----------------------------------------------------------------------------|
|                  Copyright (c) 1998 - 2005 Erik Arvidsson                   |
|-----------------------------------------------------------------------------|
| Basic object to allow updating the hash part of the document location.      |
| Mozilla always adds an entry to the history but for IE we add an optional   |
| flag whether to add an entry to the history and if this is set an iframe is |
| used to support this behavior (this is on by default).                      |
|                                                                             |
| When the hash value changes onHashChanged is called. Override this to do    |
| your own callbacks.                                                         |
|                                                                             |
| Usage: Include script                                                       |
|        Override onHashChanged: hashListener.onHashChanged = fn              |
|                                                                             |
| Known issues: Known to not work with Opera                                  |
|               Not tested with KHTML/Safari                                  |
|               Might interfere with other iframe based loading               |
|- ---------------------------------------------------------------------------|
| This software is provided "as is", without warranty of any kind, express or |
| implied, including  but not limited  to the warranties of  merchantability, |
| fitness for a particular purpose and noninfringement. In no event shall the |
| authors or  copyright  holders be  liable for any claim,  damages or  other |
| liability, whether  in an  action of  contract, tort  or otherwise, arising |
| from,  out of  or in  connection with  the software or  the  use  or  other |
| dealings in the software.                                                   |
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| ... removed standard license part of header for now...                      |
|-----------------------------------------------------------------------------|
| 2005-05-15 | First version                                                  |
|-----------------------------------------------------------------------------|
| Created 2005-05-15 | All changes are in the log above. | Updated 2005-05-15 |
\----------------------------------------------------------------------------*/

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;
    },
    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();

hashListener.onHashChanged = function(){
    var hashvalue = unescape(document.location.hash);
    if (hashvalue.indexOf("#") >= 0){
        hashvalue = hashvalue.substring(hashvalue.indexOf("#")+1);
    }
    if(hashvalue.indexOf("?") >= 0 && hashvalue.length > 1){
        initGetContent(hashvalue.substring(hashvalue.indexOf("?")+1));
    }
}