/*!
* Back Button Detection Object V 1.0.1
* http://www.brookebryan.com/
*
* Copyright 2010, Brooke Bryan
*
* Date: Thu 27 Jan 2011 13:37 GMT
*/

var bajb_backdetect = {
    Version: '1.0.0',
    Description: 'Back Button Detection',

    Browser: {
        IE: !!(window.attachEvent && !window.opera),
        Safari: navigator.userAgent.indexOf('Apple') > -1,
        Opera: !!window.opera
    },

    FrameLoaded: 0,
    FrameTry: 0,
    FrameTimeout: null,

    OnBack: function () {
        return true;
    },

    BAJBFrame: function () {
        var BAJBOnBack = document.getElementById('BAJBOnBack');
        if (bajb_backdetect.FrameLoaded > 1) {
            if (bajb_backdetect.FrameLoaded == 2) {
                if (bajb_backdetect.OnBack()) {
                    history.back();
                }
            }
        }
        bajb_backdetect.FrameLoaded++;
        if (bajb_backdetect.FrameLoaded == 1) {
            if (bajb_backdetect.Browser.IE) {
                bajb_backdetect.SetupFrames();
            }
            else {
                bajb_backdetect.FrameTimeout = setTimeout("bajb_backdetect.SetupFrames();", 700);
            }
        }
    },

    SetupFrames: function () {
        clearTimeout(bajb_backdetect.FrameTimeout);
        var BBiFrame = document.getElementById('BAJBOnBack');
        var checkVar = BBiFrame.src.substr(-11, 11);

        if (bajb_backdetect.FrameLoaded == 1 && checkVar != "HistoryLoad") {
            BBiFrame.src = "blank.html?HistoryLoad";
        }
        else {
            if (bajb_backdetect.FrameTry < 2 && checkVar != "HistoryLoad") {
                bajb_backdetect.FrameTry++;
                bajb_backdetect.FrameTimeout = setTimeout("bajb_backdetect.SetupFrames();", 700);
            }
        }
    },

    SafariHash: 'false',
    Safari: function () {
        if (bajb_backdetect.SafariHash == 'false') {
            if (window.location.hash == '#b') {
                bajb_backdetect.SafariHash = 'true';
            }
            else {
                window.location.hash = '#b';
            }
            setTimeout("bajb_backdetect.Safari();", 100);
        }
        else if (bajb_backdetect.SafariHash == 'true') {
            if (window.location.hash == '') {
                bajb_backdetect.SafariHash = 'back';
                if (bajb_backdetect.OnBack()) {
                    history.back();
                }
            }
            else {
                setTimeout("bajb_backdetect.Safari();", 100);
            }
        }
    },

    Initialise: function () {
        if (bajb_backdetect.Browser.Safari) {
            setTimeout("bajb_backdetect.Safari();", 600);
        }
        else {
            document.write('<iframe src="blank.html" style="display:none;" id="BAJBOnBack" onunload="alert(\'de\')" onload="bajb_backdetect.BAJBFrame();"></iframe>');
        }
    }
};
bajb_backdetect.Initialise();