function HideContent(d) {
        if(d.length < 1) { return; }
        document.getElementById(d).style.display = "none";
        }
        function ShowContent(d) {
        if(d.length < 1) { return; }
        document.getElementById(d).style.display = "block";
        }
        function ChangeClassOn(d, e, f) {
        if(d.length <1) {return; }
        document.getElementById(d).className = "on";
        document.getElementById(e).className = "none";
        document.getElementById(f).className = "none";
        }