function hidediv(id) {
    //safe function to hide an element with a specified id
    try {
        if (document.getElementById) { // DOM3 = IE5, NS6
            document.getElementById(id).style.visibility = "hidden";
        }
        else {
            if (document.layers) { // Netscape 4
                document.id.visibility = "hidden";
            }
            else { // IE 4
                document.all.id.style.visibility = "hidden";
            }
        }
    }
    catch (e) {
        
    }
}

function showdiv(id) {
    //safe function to show an element with a specified id
    try {
        if (document.getElementById) { // DOM3 = IE5, NS6
            document.getElementById(id).style.visibility = "visible";
        }
        else {
            if (document.layers) { // Netscape 4
                document.id.visibility = "visible";
            }
            else { // IE 4
                document.all.id.style.visibility = "visible";
            }
        }
    }
    catch (e) {
        
    }
}