function blankfield (id, valueconfront) {
    if (document.getElementById(id).value==valueconfront)
        document.getElementById(id).value='';
}
function reenter (id, valueconfront) {
    if (document.getElementById(id).value=='')
        document.getElementById(id).value=valueconfront;
}
function mostra_tbpassword(id) {
    document.getElementById("PswDisplay").style.display = 'none';
    document.getElementById(id).style.display = 'block';
    document.getElementById(id).focus();
}

function mostra_tbpasswordreg(elIDhid, elIDshow) {
    document.getElementById(elIDhid).style.display = 'none';
    document.getElementById(elIDshow).focus();
}
function reshowpsw(elIDhid, elIDshow) {
    if (document.getElementById(elIDhid).value == '')
        document.getElementById(elIDshow).style.display = 'block';
}