function hidediv(id) {
            //safe function to hide an element with a specified id
            if (document.getElementById) { // DOM3 = IE5, NS6
                document.getElementById(id).style.display = 'none';
            }
            else {
                if (document.layers) { // Netscape 4
                    document.id.display = 'none';
                }
                else { // IE 4
                    document.all.id.style.display = 'none';
                }
            }
        }

        function showdiv(id) {
            //safe function to show an element with a specified id

            if (document.getElementById) { // DOM3 = IE5, NS6
                document.getElementById(id).style.display = 'block';
            }
            else {
                if (document.layers) { // Netscape 4
                    document.id.display = 'block';
                }
                else { // IE 4
                    document.all.id.style.display = 'block';
                }
            }
        }