thisMovie = function(movieName) {
    if (navigator.appName.indexOf("Microsoft") != -1) {
        return window[movieName];
    } else {
        return document[movieName];
    }
}
function prevPage() {
    var currPg = parseFloat(document.getElementById("currentpage").innerHTML)
    currPg = (currPg - 1);
    document.getElementById("currentpage").innerHTML = "0" + String(currPg);
    checkpagingControls()
    thisMovie("gallery").prevPage();    
}
function nextPage() {
    var currPg = parseFloat(document.getElementById("currentpage").innerHTML)
    currPg = (currPg + 1);
    document.getElementById("currentpage").innerHTML = "0" + String(currPg);
    checkpagingControls()
    thisMovie("gallery").nextPage();
}
function checkpagingControls() {
    var currPage = document.getElementById("currentpage").innerHTML;
    var lastPage = document.getElementById("lastpage").innerHTML;

    if (currPage == lastPage) {
        document.getElementById("btnNext").className = "displaynone";
    } else {
    document.getElementById("btnNext").className = "";
    }

    if (currPage == "01") {
        document.getElementById("btnPrev").className = "displaynone";
    } else {
    document.getElementById("btnPrev").className = "";
    }
}
function hidenavButtons() {
    document.getElementById("buttons").className = "displaynone";
}
function shownavButtons() {
    document.getElementById("buttons").className = "";
}