function detectTapatalk() {
    if (document.cookie.indexOf("tapatalk_redirect=false") < 0) {
        if (!navigator.userAgent.match(/Opera/i) && !navigator.userAgent.match(/Dolphin/i)) {
            if ((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))) {
                setTapatalkCookies();
                if (confirm("Tetongravity.com has an Iphone app! Click OK to download."))
                    window.location = "http://itunes.apple.com/us/app/tgr-forums/id479373849?mt=8";
            } else if(navigator.userAgent.match(/iPad/i)) {
                setTapatalkCookies();
                if (confirm("Tetongravity.com has an IPad app! Click OK to download."))
                    window.location = "http://itunes.apple.com/us/app/tgr-forums/id479373849?mt=8";
            } else if(navigator.userAgent.match(/android/i)) {
                setTapatalkCookies();
                if (confirm("Tetongravity.com has an Android app! Click OK to download."))
                    window.location = "https://market.android.com/details?id=com.quoord.tapatalktg.activity#?t=W251bGwsMSwxLDIxMiwiY29tLnF1b29yZC50YXBhdGFsa3RnLmFjdGl2aXR5Il0";
            } 
        }
    }
}

function setTapatalkCookies() {
    var date = new Date();
    var days = 30;
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+ date.toGMTString();
    document.cookie = "tapatalk_redirect=false" + expires; 
}

 detectTapatalk();