var currentPage;
document.oncontextmenu = DisableRightClick;
function DisableRightClick() {
    return false;
}
function ChangeStyle(obj, objclass) {
    if (obj != currentPage) {
        document.getElementById(obj).className = objclass;
    }
}
function ChangeCurrentPage(obj, objclass) {
    currentPage = obj;
    document.getElementById(obj).className = objclass;
}