// JScript File
    function hideControl(elemId) {
        var elem = document.getElementById(elemId);

        if(elem == null)
            alert('Element not found!');
        else
            elem.style.display = 'none';
    }
    function showControl(elemId) {
        var elem = document.getElementById(elemId);

        if(elem == null)
            alert('Element not found!');
        else
            elem.style.display = 'block';
    }